Perth's Toshiba fault code lookup
Toshiba fault codes decoded
103 codes covered — what each one means, the likely cause, and whether it's worth trying something yourself before booking. Compiled from Toshiba documentation.
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Toshiba runs two unrelated code systems, and knowing which one you're looking at matters more than the code itself. Residential wall splits signal through indicator lamp patterns and two-character check codes; ducted and light-commercial systems on a wired controller use alphanumeric E, F, H, L and P codes. Both sets are below, kept firmly apart.
Before you scroll: exact meanings can vary between model series — treat this as a well-informed starting point, not a service manual for your specific unit. And if a code appears alongside burning smells, breaker trips or water pouring from the unit, skip the table: switch off and call 0434 951 341.
How to find your Toshiba fault code
1
Wall splits — indicator lamp patterns
- 1 Toshiba wall splits without a display signal through the OPERATION and TIMER lamps, using flash RATE and which lamps are lit — not a simple count.
- 2 OPERATION flashing on its own at about 1 Hz records that the power supply was interrupted while the unit was on.
- 3 OPERATION and TIMER flashing together points at the connecting cable and serial signal between indoor and outdoor units.
- 4 Because the patterns vary between series, photograph or video the lamps and check against your model's manual — or quote what you see to your technician.
2
Wall splits — the 2-digit check codes
- 1 Residential RAS models can report a two-character check code retrieved with the CHECK button on the infrared remote.
- 2 The codes are grouped by block: 00 indoor, 01 communication, 02 outdoor control board, 03 compressor and other.
- 3 These are a different scheme from the wired-controller codes below — don't cross-read them.
3
Ducted and light-commercial — wired controller
- 1 Systems on an RBC-AMT wired controller (RAV ducted and VRF equipment) display alphanumeric codes: E for communication, F for sensors, H for compressor, L for setup, P for protection trips.
- 2 The code shows directly on the controller screen.
Worth knowing: Toshiba runs two unrelated code systems. Residential RAS wall splits use lamp patterns and two-character check codes; RAV light-commercial ducted and VRF systems use the E/F/H/L/P codes on a wired controller. The same letters and numbers mean different things across the two, and a few codes (F02 in particular) differ again between RAV and VRF — always start by identifying which system you have.
Toshiba fault code tables
Try this first safe check before calling anyone Book a service needs a technician Switch off & call stop running the system
Wall splits with no display — indicator lamp patterns (Seiya / Shorai / Shorai Edge)
| Code | What it means | Likely cause | What to do |
|---|---|---|---|
| OPERATION lamp flashing slowly, about 1 flash per second (no other lamp) | The unit registered a power interruption while it was switched on. This is a notification, not a breakdown — the system is telling you it lost supply and has restarted. | Blackout, brownout, surge, or someone switching the isolator/breaker off and on while the unit was running. Common after storms. | Try this first Switch the air conditioner off at the wall isolator or circuit breaker, wait a full 2 minutes, then switch back on and restart from the remote. If the slow flash clears and the unit runs normally, nothing further is needed. |
| OPERATION lamp flashing fast, about 5 flashes per second (TIMER lamp off) | A protective circuit has tripped on either the indoor control board (block 00) or the outdoor control board (block 02). On 2-lamp Seiya/Shorai models these two blocks look identical from the lamps alone. | Indoor board fault, indoor fan motor fault, an indoor or outdoor sensor out of range, or an outdoor inverter board fault. Cannot be narrowed further without retrieving the 2-digit code. | Book a service |
| OPERATION lamp AND TIMER lamp both flashing fast, about 5 flashes per second | A protective circuit has tripped on either the interconnecting cable / serial signal system (block 01) or on the compressor and other outdoor components (block 03). | Broken or wrongly landed interconnecting cable, blown fuse on the inverter board, or a compressor/discharge-temperature/overcurrent protection trip. Block 03 faults are the serious end of the range. | Book a service |
| Release status: OPERATION flashing at 1 Hz, TIMER off (check code 33) | Current release — the unit is deliberately winding the compressor back because it is drawing more current than it should for the conditions. It is protecting itself, not broken yet. | Extreme ambient conditions, restricted airflow across either coil, low supply voltage, or a developing compressor/refrigerant problem. | Try this first Clean the indoor filters and clear at least 300 mm of space and all leaves, grass clippings and debris from around and on top of the outdoor unit, then run it again. If it keeps throttling, book a technician. |
| Release status: OPERATION flashing at 2 Hz, twice every second, TIMER off (check code 33) | TD release — the compressor discharge temperature is climbing toward its limit and the unit is throttling back to avoid a shutdown. | Usually low refrigerant charge (a leak), a restricted expansion valve, or a badly blocked outdoor coil. | Book a service |
| Release status: TIMER flashing at 1 Hz, OPERATION off (check code 33) | TC release — the indoor coil temperature has hit a limit, so the unit is reducing output. In cooling this is usually anti-freeze protection; in heating it is high-pressure protection. | Blocked filters, closed or blocked outlets, a dirty indoor coil, or a fan speed set too low. | Try this first Take out and wash the indoor filters, make sure no furniture, curtains or closed vents are blocking the indoor unit's airflow, and set the fan to Auto or High rather than Low. |
Wall splits — 2-digit check codes, indoor unit block (00)
| Code | What it means | Likely cause | What to do |
|---|---|---|---|
| 0C | Room temperature sensor (TA) fault — the sensor that reads the air temperature at the indoor unit is open or short circuit. | Failed thermistor, a sensor that has come out of its holder, or a damaged plug on the indoor control board. | Book a service |
| 0d | Indoor coil temperature sensor (TC) fault — open, short, dislodged from its pocket, or fitted in the wrong position. | Failed thermistor or a sensor bulb that has vibrated out of its clip on the indoor heat exchanger. | Book a service |
| 05 | Indoor-to-outdoor communication error, unit continues to operate (serial signal degraded/intermittent rather than lost). | Damaged, undersized or reversed interconnecting comms conductor, loose terminal screw, moisture/corrosion at the outdoor terminal block, or induced noise from power cabling. Sits alongside the already-listed 04 (full comms loss, system stop) — 04 without 05 leaves the intermittent-comms case undocumented. | Try this first |
| 08 | Reverse temperature change — indoor coil temperature moves the wrong way for the selected mode (cooling output in heat mode or heating output in cool mode). | 4-way reversing valve stuck, not energising or leaking internally; failed 4-way valve coil; indoor coil sensor (TC) out of position or cross-wired between heads on a multi; incorrect indoor/outdoor pipe pairing. This is the wall-split equivalent of the P19 4-way valve fault already listed for ducted. | Book a service |
| 09 | No temperature change / frost condition — indoor coil temperature fails to change after start, or freeze-prevention control has forced the indoor fan to low with the outdoor unit stopped. | Refrigerant shortage or leak, blocked or dirty filters and restricted indoor airflow, blocked/kinked pipework, closed service valve, compressor running but not pumping, TC sensor out of position, or cross-wired indoor/outdoor pairs on a multi. Presents to customers as 'ice on the indoor coil and no cold air'. | Try this first |
| 11 | Indoor fan motor fault — the fan has failed, is locked, or its drive circuit on the indoor board has a problem. The whole unit shuts down. | Seized or obstructed fan barrel, failed DC fan motor, broken motor plug, or a failed fan drive circuit on the indoor board. | Book a service |
| 12 | Other fault on the indoor control board. A catch-all for indoor PCB failures that do not fit the other codes. | Failed indoor printed circuit board — Toshiba's remedy for this code is simply to replace the board. | Book a service |
| 16 | Compressor position detection circuit error (rotor position detection failure on the inverter drive). | Failed inverter/IPM section of the outdoor PCB, open or high-resistance compressor winding, loose compressor drive terminals, or a compressor that will not start/lock. Some model families report this on 15 and others on 16 — a reference listing only 15 will fail to decode the 16 variant. | Book a service |
Wall splits — 2-digit check codes, communication block (01)
| Code | What it means | Likely cause | What to do |
|---|---|---|---|
| 04 | Serial signal / connecting cable fault between the indoor and outdoor units. | Toshiba lists both wiring and refrigerant-side causes: defective or mis-wired connecting cable, or the operation signal never arriving from the indoor unit. | Book a service |
Wall splits — 2-digit check codes, outdoor control board (02)
| Code | What it means | Likely cause | What to do |
|---|---|---|---|
| 1A | Outdoor fan failure, or a fault in its drive circuit on the inverter board. Without condenser airflow the whole system stops. | Fan motor seized or obstructed, failed fan motor winding, or a failed fan drive circuit on the outdoor board. | Try this first Switch the system off at the isolator/breaker first, then look through the outdoor fan grille for leaves, sticks, plastic bags or a bird's nest and clear anything fouling the blade. Do not remove any panel or put your fingers through the grille. Restore power after 2 minutes — if the code returns, book a technician. |
| 1C | Compressor drive output error — the relationship between voltage, current and frequency is abnormal. | Most commonly compressor overloading caused by refrigerant overcharge, as well as drive or compressor faults. | Switch off & call |
| 1b | Outdoor ambient air temperature sensor (TO) fault — open or short circuit. The unit keeps running but loses some efficiency and defrost accuracy. | Failed outdoor air thermistor or its connection to the outdoor board. | Book a service |
| 14 | Short-term overcurrent on the inverter circuit — the current to the compressor exceeded its limit almost instantly and the drive shut down. | Failed inverter board or shorted IGBT power transistor, or a compressor drawing far too much current (locked rotor, shorted windings). | Switch off & call |
| 15 | Compressor position-detection circuit error, or a short between the compressor windings. The inverter cannot work out where the motor is and refuses to drive it. | Failed inverter board, or a compressor with a winding short (a rare short between turns). | Switch off & call |
| 17 | Current-detection circuit error on the outdoor inverter board — the board cannot measure compressor current, so it will not run the compressor at all. | Failed current-sensing circuit on the outdoor inverter board. Toshiba's remedy is board replacement. | Switch off & call |
| 18 | Outdoor coil sensor (TE) or suction pipe sensor (TS) fault — open, short, dislodged, or the two sensors swapped into each other's sockets. | Failed thermistor, damaged lead, or the sensors cross-plugged during a previous repair. | Book a service |
| 19 | Discharge pipe temperature sensor (TD) fault — open or short circuit. This is the sensor that guards the compressor against overheating, so the unit stops rather than run blind. | Failed thermistor on the compressor discharge line, or a chafed/disconnected lead. | Book a service |
Wall splits — 2-digit check codes, compressor and other (03)
| Code | What it means | Likely cause | What to do |
|---|---|---|---|
| 1E | Discharge temperature exceeded 117 degrees C. The compressor was running dangerously hot and the unit shut down to save it. | Low refrigerant charge from a leak, a failed or stuck pulse motor (expansion) valve, a faulty TD sensor, or anything blocking heat rejection. | Switch off & call |
| 1F | The compressor is still drawing high current even after the inverter has wound the operating frequency right down to its minimum. The system stops. | Refrigeration cycle problem, installation fault, repeated brief power failures, or a compressor that is breaking down. | Switch off & call |
| 1d | Compressor does not rotate — the current protection circuit detected the compressor failing to turn. | Toshiba's stated causes: missed wiring, a missing phase, or a shortage in the compressor windings. | Switch off & call |
| 07 | The outdoor unit started, then stopped sending its return signal to the indoor unit part-way through the run. The indoor fan keeps going but the outdoor unit is stopped. | Brief power interruption, an outdoor protection device (high pressure switch, thermal relay) opening the signal circuit, or an intermittently failing board. Often shows as the system running and stopping on a 10-40 minute cycle. | Try this first Turn the system off at the isolator or circuit breaker for 2 full minutes, then restore power and run it. If the stop/start cycling returns, stop using it and book a technician — a repeatedly tripping pressure or thermal protector needs investigating. |
| 21 | The outdoor unit's return signal stopped, together with the indoor or outdoor coil running abnormally hot — outdoor coil (TE) in cooling, indoor coil (TC) in heating. A heat-rejection problem. | Toshiba's first remedy for this code is cleaning: blocked filters, a dirty indoor coil, or an outdoor coil choked with dust, lint, leaves or grass clippings. Can also be a genuine high-pressure or power supply problem. | Try this first Wash the indoor filters, then switch off at the breaker and hose the outdoor unit's finned coil gently from the outside in (water only, low pressure, no covers removed) and clear all debris and vegetation within 300 mm of it. Allow it to dry, restore power and retry. If the code comes back, book a technician. |
Wired-controller systems (RAV light-commercial ducted / VRF) — E codes: communication and addressing
| Code | What it means | Likely cause | What to do |
|---|---|---|---|
| E01 | Remote controller communication error — no signal received from the indoor unit, or no master remote controller is set. | Controller wiring fault, or (just as common in the field) no controller has been assigned as master in a twin-controller setup. | Book a service |
| E02 | The wall controller cannot send its signal to the indoor unit — a transmit failure inside the controller itself. | Failed sending circuit inside the wall controller. Toshiba's remedy is to replace the controller. | Book a service |
| E03 | The indoor unit has stopped hearing from the wall controller (or a network/communication adapter). The system stops and will reset itself automatically if communication returns. | Control cable damaged, a terminal that has worked loose, a failed controller, or the fault following a power interruption or nearby electrical work. | Try this first Turn the system off at the isolator or circuit breaker, wait 2 full minutes, then restore power. E03 self-clears if communication comes back. If it reappears, book a technician — do not open the controller or the indoor unit. |
| E04 | The indoor unit is not receiving the serial signal from the outdoor unit. The fan may run indoors but there is no heating or cooling. | Interconnecting cable miswired, damaged or loose; a failed serial sending circuit on the outdoor board; or a failed receiving circuit on the indoor board. | Book a service |
| E08 | Two or more indoor units on the same system have been given the same address, so the controller cannot tell them apart. | Addressing not completed properly after an install, a board replacement, or a change from individual to group control. | Book a service |
| E09 | Two master remote controllers detected. In a twin-controller setup only one may be set as master. | Both wall controllers (or a wall controller and a wireless kit) set as master. One must be reconfigured as the sub controller. | Book a service |
| E10 | Internal communication error inside the indoor unit — the fan-drive microprocessor and the main microprocessor have stopped talking to each other. | Failed indoor control board, or a power supply problem to the indoor unit. | Book a service |
| E11 | Communication error between the indoor unit and an application control kit (an accessory interface board). | Loose or damaged harness between the kit and the indoor board, a power supply issue, or a failed board. | Book a service |
| E18 | Regular communication has failed between the master and follower indoor units, or between a twin system's main and sub units. | Damaged wiring between the linked indoor units, an indoor unit without power, or a failed indoor board. | Book a service |
Ducted, multi and wired-controller systems — F codes (temperature sensors and memory)
| Code | What it means | Likely cause | What to do |
|---|---|---|---|
| E06 | Dropping out of indoor unit — the outdoor unit no longer sees an indoor unit that was previously communicating (number of indoor units detected has reduced). | Loss of power to an indoor unit (tripped indoor circuit/isolator), damaged or corroded indoor-outdoor communication wiring, water ingress in a junction box, loose terminal, or a failed indoor PCB. Very common after storms, rodent damage or a tripped breaker on one indoor unit of a multi. | Try this first |
| E07 | Indoor-outdoor communication circuit error detected at the outdoor end (serial signal from indoor not received by the outdoor unit). | Interconnecting comms wire broken, shorted, reversed or run in the same conduit as power causing interference; corroded terminal block; failed outdoor interface PCB. Pairs with E04 (same fault seen from the indoor end) — a reference with E04 but not E07 covers only half of the interconnect-wiring family. | Book a service |
| E12 | Automatic address starting error — automatic addressing was started while another refrigerant system on the same comms line was already addressing, or while the line was not ready. | Two systems auto-addressing simultaneously, central control line still connected during addressing, or comms wiring linked between separate refrigerant circuits. Seen constantly at commissioning and after a board replacement on multi-head systems. | Book a service |
| E15 | Indoor unit not found during automatic address setting. | Indoor unit unpowered or powered up after the outdoor unit, comms wire not landed on the indoor terminal, indoor PCB failure, or comms wiring run too long / wrong type. Typical on a new install or after replacing an indoor head on a multi. | Book a service |
| E16 | Too many indoor units connected / total indoor capacity exceeds the outdoor unit's allowance (capacity-over). | More indoor heads connected than the multi outdoor unit supports, combined indoor capacity above the permitted percentage, or an indoor capacity DIP/EEPROM setting wrong after a board swap. Common on 3-, 4- and 5-head multi systems that have been added to. | Book a service |
| E20 | Connection to another refrigerant line found during automatic address setting. | Comms wiring accidentally bridged between two separate outdoor systems, or a central-control/network cable left connected while auto-addressing. Frequent in dual-system houses where both outdoor units share a cable run. | Book a service |
| E31 | IPDU communication error — internal communication failure between the outdoor interface PCB and the inverter/fan power drive boards (IPDU). | Loose or unplugged inter-board ribbon/harness inside the outdoor unit, moisture or insect ingress on the boards, failed inverter PCB, or supply voltage problem. Common on inverter ducted and multi outdoor units and normally reported alongside L29. | Book a service |
| F01 | Indoor coil temperature sensor TCJ has come adrift, gone open circuit or shorted. The system stops and retries automatically. | Failed thermistor or a sensor that has vibrated out of its pocket on the indoor heat exchanger. | Book a service |
| F02 | Indoor heat exchanger temperature sensor (TC) error — disconnected, come loose or short circuit. | Failed or unseated coil thermistor on the indoor unit. (Light-commercial RAV equipment; VRF systems define F02 differently.) | Book a service |
| F03 | Indoor TC1 sensor error (indoor heat-exchanger coil temperature sensor 1 open, shorted or out of position). | Sensor thermistor failed, sensor bulb dislodged from its coil pocket, or damaged/unplugged sensor lead at the indoor PCB. The list already has F01 (TCJ) and F02 (TC2) but omits TC1 — the most commonly used of the three indoor coil sensors, and a frequent cause of 'blows but never gets cold / fan won't start in heating' calls. | Book a service |
| F04 | Compressor discharge temperature sensor (TD) fault — open or short circuit. The unit stops because it can no longer protect the compressor from overheating. | Failed thermistor on the compressor discharge pipe, or a chafed or disconnected lead in the outdoor unit. | Book a service |
| F05 | TD2 sensor error (second compressor discharge temperature sensor open or short-circuit). | Failed discharge thermistor, sensor not seated in its pocket on the discharge pipe, or damaged lead/connector. Applies to twin-compressor and larger multi outdoor units; completes the F04/F05 discharge-sensor pair. | Book a service |
| F06 | Outdoor heat exchanger temperature sensor (TE) error — disconnected or short circuit. | Failed or unseated outdoor coil thermistor. | Book a service |
| F07 | TL sensor error (outdoor liquid-line / heat-exchanger outlet temperature sensor open or short-circuit). | Failed thermistor, sensor dislodged from its holder on the liquid pipe, chafed or rodent-damaged lead, or connector corrosion at the outdoor PCB. The list includes F06 (TE) and F15 (TE/TL wiring) but not TL itself. | Book a service |
| F08 | Outside air temperature sensor (TO) fault. Unusually, the system keeps operating with this one, but efficiency and defrost timing suffer. | Failed outdoor ambient thermistor or its plug on the outdoor board. | Book a service |
| F10 | Indoor return-air temperature sensor (TA) error — disconnected or short circuit. The system keeps running in a limited state rather than stopping. | Failed or unseated return-air thermistor on the indoor unit. | Book a service |
| F11 | Indoor TF sensor error (indoor fan motor / discharge-air temperature sensor). | Failed thermistor, unplugged or damaged sensor harness at the indoor PCB, or indoor board input failure. Sits between F10 (TA) and F12 (TS1), both of which are already listed. | Book a service |
| F12 | Suction pipe temperature sensor (TS) fault — open or short circuit. Listed separately from F06 on the current R32 Digital Inverter (RAV-GM) range. | Failed thermistor on the suction line, or a damaged lead. | Book a service |
| F13 | Heat sink temperature sensor (TH) fault. This sensor is mounted on the outdoor board itself and guards the inverter electronics from overheating. | Failed sensor, which on this design generally means the outdoor control board needs replacing. | Book a service |
| F15 | Outdoor coil (TE) and suction (TS) sensors are mounted or plugged in the wrong way round — the readings do not make sense relative to each other. | Sensors cross-connected during installation or a previous repair, or one sensor out of its pocket. | Book a service |
| F16 | Outdoor pressure sensor wiring error — high-pressure (Pd) and low-pressure (Ps) sensors swapped or miswired. | Pd and Ps plugs interchanged at the outdoor PCB (typically after a board or sensor replacement), or a sensor connector partially inserted. Directly analogous to F15 for temperature sensors, which is already covered. | Book a service |
| F23 | Ps sensor error (low-pressure / suction pressure sensor faulty or out of range). | Failed pressure transducer, damaged or unplugged sensor lead, moisture in the connector, or an outdoor PCB input fault. Often mistaken for a refrigerant fault because it presents as poor or no cooling. | Book a service |
| F24 | Pd sensor error (high-pressure / discharge pressure sensor faulty or out of range). | Failed pressure transducer, damaged connector/harness, or outdoor PCB input failure. Frequently appears together with, or is confused for, P04/P20 high-pressure trips. | Book a service |
| F29 | Indoor EEPROM error — the indoor board cannot read or write its own configuration memory. | Failed EEPROM chip (sometimes just not seated in its socket) or a failed indoor board. | Book a service |
| F31 | Outdoor EEPROM error — the outdoor board's configuration memory has failed. | Failed outdoor control board. | Book a service |
| H04 | Compressor case thermostat (case thermo) operation — the compressor shell temperature protection has opened. | Compressor overheating from refrigerant shortage, restricted or blocked condenser airflow, failed outdoor fan, non-condensables/wrong charge, or a genuinely failing compressor. Continued operation risks compressor burnout. | Switch off & call |
| H05 | TD1 sensor miswiring / incomplete insertion (discharge temperature sensor not correctly fitted). | Discharge sensor not pushed fully into its pocket on the compressor discharge pipe, sensor swapped with another thermistor, or connector partially inserted at the outdoor board — usually after a sensor or compressor replacement. | Book a service |
| H06 | Activation of low-pressure protection (suction pressure fell below the protection threshold, typically ~0.02 MPa on the Ps sensor). | Refrigerant shortage or leak, closed/partly closed service valve, blocked or restricted liquid line, failed PMV/expansion valve, iced indoor coil from a dirty filter, or a faulty low-pressure sensor. This is the classic 'unit ices up then stops cooling' fault and is the single most common refrigerant-loss trip on ducted systems — running the unit in this state destroys compressors. | Switch off & call |
| L04 | Duplicated outdoor line address — two outdoor units on the same comms line share the same line address. | Two systems set to the same line number after a board replacement or DIP/rotary switch reset, or two refrigerant systems inadvertently linked by shared comms wiring. | Book a service |
| L05 | Duplicated priority indoor unit (displayed on the priority indoor unit). | More than one indoor unit configured as the priority/master unit on a multi system, usually after indoor PCB replacement or a re-address. Pairs with L06, the same fault reported by the non-priority units. | Book a service |
| L06 | Duplicated priority indoor unit (displayed on indoor units other than the priority unit). | Same root cause as L05 — two or more heads set as priority. Both codes commonly appear at once on different controllers in the same system. | Book a service |
| L28 | Too many outdoor units connected to one refrigerant line. | More outdoor modules linked than the system supports, or comms wiring bridging two independent outdoor units so the controller sees them as one system. | Book a service |
| P01 | Indoor fan motor error (fan does not reach commanded speed, or no rotation feedback returned). | Seized or dragging blower/fan motor bearing, blocked or fouled blower wheel, damaged fan motor winding, loose/damaged fan feedback (Hall sensor) plug at the indoor PCB, or a failed fan drive circuit on the indoor board. Distinct from P12, which is the same fault flagged specifically by the feedback circuit — a reference that lists P12 but not P01 will miss a large share of real ducted fan-motor faults. | Book a service |
| P13 | Outdoor liquid backflow detection error (liquid refrigerant returning to the compressor / abnormal refrigerant flow detected). | Overcharge, stuck or failed PMV/expansion valve, leaking solenoid or check valve, indoor unit running with an unmatched/incorrect capacity setting, or a low-load condition returning liquid. Liquid slugging damages compressors quickly. | Switch off & call |
| P17 | Discharge temperature TD2 error — second compressor discharge temperature exceeded its protection limit. | Refrigerant shortage or leak, PMV/expansion valve not opening, blocked strainer, poor condenser airflow, or a faulty TD2 sensor. Completes the discharge-temperature protection family alongside the already-listed P03. | Switch off & call |
Wired-controller systems (RAV light-commercial ducted / VRF) — H codes: compressor
| Code | What it means | Likely cause | What to do |
|---|---|---|---|
| H01 | Compressor breakdown. The unit started, could not hold its operating frequency, wound down to minimum and stopped — or a short-circuit current was detected in the compressor motor. | Failing compressor, badly overloaded refrigeration cycle, or supply voltage outside the required range (nominally 198-264 V at 50 Hz). | Switch off & call |
| H02 | Compressor lock. The overcurrent protection operated a set time after the compressor was told to start — the motor is not turning. | Mechanically seized compressor, or compressor wiring with a missing/open phase. | Switch off & call |
| H03 | Current detection circuit error — the outdoor board is reading current when the compressor is off, or cannot measure it correctly. | Failed AC current-detection circuit on the outdoor control board, or a supply phase problem. | Switch off & call |
Ducted, multi and wired-controller systems — L codes (setup, system and outdoor unit)
| Code | What it means | Likely cause | What to do |
|---|---|---|---|
| L03 | More than one indoor unit in a group is set as the master. Only one may hold that role. | Group configuration not completed, or changed after commissioning without re-running the address setup. | Book a service |
| L07 | An indoor unit that is set up as an individual unit has a group control cable connected to it. | Wiring/configuration mismatch from installation or a later system change. | Book a service |
| L08 | Indoor group address has not been set. | Address setup never completed, or reset by a board replacement. | Book a service |
| L09 | Indoor unit capacity has not been set. The board does not know what size unit it is driving. | Capacity code (setting DN=11 on current models) not entered after an indoor board replacement. | Book a service |
| L10 | Model type not set on a replacement outdoor service board — the model-select jumper is missing or wrong. | A service (blank) outdoor board fitted without cutting/setting the model-type jumper for that specific model. | Book a service |
| L20 | Duplicated central control addresses on a networked (TCC-LINK) system. | Two units given the same central address, or a network adapter switch set incorrectly. | Book a service |
| L29 | Outdoor unit error — a grouped code covering several serious outdoor faults: an outdoor board fault (EEPROM or heat-sink sensor), an unset service board model type, heat sink overheating, gas leak detection, or a 4-way valve system fault. On older Super Digital Inverter models it also covers a communication failure between the outdoor control board and the inverter (IPDU) section. | Failed outdoor control board or inverter section, a connector that has come off between them, an overheating inverter heat sink, or an abnormally overloaded refrigeration cycle. | Switch off & call |
| L30 | Abnormal external interlock input — an outside device wired into the indoor unit's interlock terminal has told it to stop. | A linked device such as a fire/smoke system, ventilation interlock, condensate alarm or BMS input has activated, or its wiring is faulty. | Book a service |
| L31 | Phase detection protective circuit operated — reverse phase or a missing phase on the supply. Seen on 3-phase light-commercial models; the indoor unit keeps running but the compressor stops. | Incoming supply phases reversed or one phase lost, or a failed outdoor board detection circuit. | Switch off & call |
Wired-controller systems (RAV light-commercial ducted / VRF) — P codes: protection trips
| Code | What it means | Likely cause | What to do |
|---|---|---|---|
| P03 | Discharge temperature error — the compressor discharge temperature (TD) went past its safe limit and the unit shut down. | Low refrigerant charge from a leak, a faulty or stuck pulse motor (expansion) valve, or a faulty TD sensor. | Switch off & call |
| P04 | High pressure switch system error — the physical high-pressure safety switch on the outdoor unit has operated. | Service valves not fully open, outdoor fan not running, blocked or filthy coils, restricted indoor airflow, a blocked expansion valve, or hot discharge air recirculating back into the outdoor unit. | Switch off & call |
| P05 | Power supply voltage error — the incoming supply is outside the range the inverter can work with. | Supply voltage out of spec (nominally 198-264 V at 50 Hz), an undersized or damaged supply cable, or a loose connection at the isolator or switchboard. | Switch off & call |
| P07 | Heat sink overheat error — the inverter power electronics in the outdoor unit are running too hot. | Blocked airflow path over the outdoor heat sink, or poor thermal contact between the board and heat sink (loose screws, missing heat transfer compound after a repair). | Switch off & call |
| P10 | Float switch operation — the condensate tray has filled because the water is not draining away. The unit stops to avoid overflowing into your ceiling or walls. | Blocked drain line (the most common cause by far), a failed condensate pump, or a faulty float switch. | Try this first Find where the drain pipe discharges outside and check it is not blocked by dirt, insects, a snail or a crushed pipe, and that nothing is sitting on the line. Clear the outlet and let the tray drain. Do not pour chemicals down it or open the indoor unit — if it trips again, book a technician to clear and flush the drain properly. |
| P12 | Indoor DC fan error — the indoor fan's position detection failed, its overcurrent protection operated, or the fan is locked. | Obstructed or seized indoor fan, failed DC fan motor, or a failed fan drive circuit on the indoor board. In a ducted system this can also follow something being drawn into the fan. | Book a service |
| P15 | Gas leak detection — the discharge (TD) or suction (TS) sensor recorded abnormal overheating consistent with the system being short of refrigerant. | A refrigerant leak, service valves not fully open, a faulty expansion valve, or a crushed/broken pipe. | Switch off & call |
| P19 | 4-way (reversing) valve error — after heating started, the indoor coil got colder instead of warmer, or the outdoor coil/suction got hotter. The unit is heating and cooling the wrong way round. | Reversing valve stuck or its coil failed, a faulty expansion valve, or a coil sensor giving a false reading. | Book a service |
| P20 | High pressure protective operation — the unit shut down on a pressure release calculated from the coil sensors, before the physical pressure switch had to act. | Toshiba's remedy list starts with airflow and cleanliness: blocked filters, clogged indoor or outdoor coils, an outdoor unit recirculating its own discharge air, or a fan problem. It can also be an overcharge of refrigerant. | Try this first Clean or replace the return air filter (in a ducted system this is usually the large grille in a hallway ceiling or wall), make sure no more than about a third of the ceiling outlets are closed off, and clear all leaves, debris and plants from around and above the outdoor unit so hot air can escape freely. Restore power after 2 minutes. If it trips again, book a technician. |
| P22 | Outdoor fan system error — overcurrent, a locked rotor or a similar fault was detected on the outdoor fan drive circuit. | Fan blade jammed by debris, a failed fan motor, supply voltage out of range, or a failed outdoor control board. | Try this first Switch the system off at the isolator or circuit breaker first, then look through the outdoor fan grille and clear any leaves, twigs, plastic or nesting material fouling the blade. Never remove a panel or reach through the grille. Restore power after 2 minutes — if the code returns, book a technician. |
| P26 | Short circuit of the compressor drive element — the IGBT/power transistor protection in the inverter operated. This is a hard electrical shutdown. | Failed inverter power stage on the outdoor board, or a compressor with a shorted (layer short) winding pulling the drive down with it. | Switch off & call |
| P29 | Position detection circuit error — the inverter cannot determine the compressor motor's rotor position, so it will not run it. | Failed position-detection circuit on the outdoor control board, or a compressor motor fault. | Switch off & call |
| P30 | Reported at a central controller: one of the indoor units in the group has raised an alarm. The code itself does not say what the fault is. | Any fault on a member indoor unit. The actual code must be read from that unit's own controller. | Book a service |
| P31 | This indoor unit has stopped because the master unit in its group has faulted (typically E03, L03, L07 or L08). It is a knock-on effect, not a fault in this unit. | A communication or addressing fault on the group's master indoor unit. | Book a service |
Ducted and multi — C codes (central controller / networked systems)
| Code | What it means | Likely cause | What to do |
|---|---|---|---|
| C05 | Central remote controller sending error — the central controller cannot transmit onto the control network. | Damaged or miswired U3/U4 communication line, a failed network adapter board, an indoor unit without power, or a missing terminating resistor. | Book a service |
| C06 | Central remote controller receiving error — the central controller is not getting responses back from the network. | Same family of causes as C05: communication wiring, network adapter board, terminating resistance, or the central controller itself. | Book a service |
| C07 | Communication fault reported on the central control (TCC-LINK) network. Seen on larger residential systems tied to a central controller. | Communication cable damage or miswiring, a failed network adapter, or a controller fault. | Book a service |
| C08 | Central control network communication or configuration fault, reported at the central controller. | Network wiring, addressing or adapter board problem on the central control system. | Book a service |
| C12 | Batch alarm of general-purpose device control interface (an alarm input from a connected general-purpose interface device). | Fault signal from equipment wired to a general-purpose control interface (e.g. BMS input, ventilation or interlock device), or a wiring/configuration fault on that interface. Completes the C05–C08 central-control family. | Book a service |
No matching code found.
Meanings vary by series and some codes are model-specific — call 0434 951 341 with the code and your model number and we'll decode it.
Reference compiled from Toshiba service and operation documentation. Codes and meanings are provided as general guidance for the Australian residential range and can differ between model series; no affiliation with Toshiba is implied.
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Fault finding across Perth from $165 inc GST — all brands, splits and ducted. Quoting the fault code gives us a head start on where to look; we then test and confirm the actual fault on site before any part is ordered, so you never pay for a part you didn't need.
Frequently Asked Questions
How do I read the flashing lamps on my Toshiba wall split?
Toshiba uses flash rate and lamp combination rather than a simple count. OPERATION flashing alone at about one flash per second records that the power was interrupted while the unit was on; OPERATION and TIMER flashing together points at the connecting cable between indoor and outdoor units. Patterns vary by series, so video the lamps and check against your model's manual.
Are the E and F codes the same as the wall-split codes?
No. The E/F/H/L/P codes belong to RAV light-commercial ducted and VRF systems on a wired controller. Residential RAS wall splits use lamp patterns and two-character check codes instead. Reading a wall-split code against the wired-controller table gives you the wrong answer entirely.
How do I get the check code out of a Toshiba wall split?
Residential RAS models report a two-character check code retrieved using the CHECK button on the infrared remote. The codes are grouped by block — 00 indoor, 01 communication, 02 outdoor control board, 03 compressor and other — and listed that way below.
My Toshiba code isn't in the list — now what?
A few codes shift meaning between RAV and VRF equipment, and older series use different tables again. Call 0434 951 341 with the code and the model number from your indoor unit and we'll decode it for your exact system.
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