When your Toshiba system stops and shows a code, that code is the system telling you roughly where the problem is. Roughly is the key word. A fault code points in a direction, it rarely names the exact fix. Find your system below, tap your code, and it will take you straight to what it means and what to do.
Before you try anything: the only DIY steps that are ever safe are switching the system off at the isolator (and waiting 20 to 30 minutes), cleaning or checking filters, checking the controller settings and batteries, and keeping the outdoor unit clear. Anything behind a panel, anything electrical, and anything involving refrigerant or gas is licensed work. If a code below says switch off and call, please take it at its word.
How to read the tables: 🟢 means there is a safe first step worth trying. 🟡 means book a service, the system needs a technician. 🔴 means switch the system off at the isolator and call us on (02) 4760 0100.
RAV light commercial (Digital Inverter / Super Digital Inverter) — code set applies across RAV indoor types: ducted, cassette, under-ceiling and high-wall (source section is the high-wall troubleshooting chapter of SVM-12042)
Where the code shows: Check code shows on the wired remote controller display. On wireless-receiver models the fault is signalled by the indoor unit's Ready / Timer / Operation lamps flashing in block patterns (alternate or simultaneous flashing depending on the fault family); per-code lamp patterns were not legible in extraction..
Tap your code: E01E02E03E04E08E09E10E18F01F02F04F06F07F08F10F12F13F15F29F31H01H02H03H04L03L07L08L09L10L20L29L30P01P03P04P05P07P10P12P15P19P20P22P26P29P31
| Code | What it means | What to do |
|---|---|---|
| E01 | The controller can't hear the indoor unit, the two have stopped talking to each other. Remote controller receiving error, detected on the controller side. Usually controller wiring; system stops (a second controller, if fitted, keeps running). |
🟢 Switch the system off at the isolator, wait 20-30 minutes, then switch it back on. If the code returns, book a service. |
| E02 | The controller can't get its commands through to the indoor unit. Remote controller transmission (send) error, controller sending circuit or wiring. |
🟢 Power-cycle at the isolator and wait 20-30 minutes before switching back on. If it comes back, book a service. |
| E03 | The indoor unit has stopped hearing from its controller. Communication stop between indoor unit and remote controller / network adaptor, detected on the indoor side. Classic appearance after a power interruption. |
🟢 Turn the system off at the isolator, wait 20-30 minutes, then turn it back on. If the code returns, book a service. |
| E04 | The indoor and outdoor units have lost contact with each other. Indoor-outdoor serial communication stop, inter-unit wiring or a board-level signal fault. Often shows after a blackout or brown-out. |
🟢 Switch off at the isolator, wait 20 to 30 minutes, switch back on. If the code returns, book a service, the connection between the units needs a technician to check it. |
| E08 | Two indoor units have been given the same address, so the system can't tell them apart. Duplicated indoor unit address, an installer addressing/commissioning issue on grouped systems. |
🟡 This is a setup fault, not something you can fix at the controller, book a service. |
| E09 | More than one controller is set as the main controller. Duplicated master remote controllers in a two-controller installation. The master unit stops; the follower keeps running. |
🟡 Book a service so the controllers can be reconfigured, one main, the rest subs. |
| E10 | A communication fault inside the indoor unit's own circuit board. Communication error between CPUs on the indoor PCB. |
🟡 Book a service, this points at the indoor unit's electronics. |
| E18 | Indoor units in the same group have stopped talking to each other. Communication stop between master and follower indoor units (twin/group setups), wiring, or one unit lost power. |
🟢 Power-cycle the whole system at the isolator (all indoor units), wait 20-30 minutes and restore power. If the code returns, book a service. |
| F01 | A temperature sensor on the indoor coil isn't reading properly. Indoor heat exchanger sensor (TCJ, liquid side) open or short circuit. |
🟡 No safe DIY fix for a sensor fault, book a service. |
| F02 | The indoor coil's main temperature sensor has failed. Indoor heat exchanger sensor (TC, vapour side) out of place, open or short circuit. |
🟡 Book a service, the sensor or its connection needs replacing. |
| F04 | The sensor watching the compressor's outlet temperature has failed. Discharge temperature sensor (TD) open or short circuit, outdoor unit. |
🟡 Book a service. The unit is protecting itself from running blind on a critical sensor. |
| F06 | An outdoor coil temperature sensor isn't reading properly. Outdoor heat exchanger sensor (TE) open or short circuit. |
🟡 Book a service, sensor faults aren't homeowner-fixable. |
| F07 | The outdoor unit's liquid-line temperature sensor has failed. Liquid temperature sensor (TL) open or short circuit. |
🟡 Book a service. |
| F08 | The outdoor air temperature sensor has failed. Ambient temperature sensor (TO) open or short circuit. The doc notes the system keeps running with this fault. |
🟡 The system may keep running, but book a service to have the sensor replaced. |
| F10 | The indoor return-air (room) temperature sensor has failed. Room temperature sensor (TA) open or short circuit. |
🟡 Book a service, the unit can't read the room temperature properly until the sensor is replaced. |
| F12 | The outdoor unit's suction temperature sensor has failed. Suction temperature sensor (TS) open or short circuit. |
🟡 Book a service. |
| F13 | The temperature sensor on the inverter's heat sink has failed. Heat sink sensor (TH) fault on the outdoor power electronics. |
🟡 Book a service, this is inside the outdoor unit's electronics. |
| F15 | Two outdoor temperature sensors appear to be swapped or fitted in the wrong positions. Sensor miswiring / mis-mounting (TE and TS) detected by the outdoor unit. |
🟡 Book a service, a technician needs to refit the sensors correctly. |
| F29 | The indoor unit's memory chip has a fault. Indoor EEPROM error, settings memory on the indoor PCB. |
🟡 Book a service, the indoor board needs attention. |
| F31 | The outdoor unit's memory chip has a fault. Outdoor PCB EEPROM error. |
🟡 Book a service, the outdoor board needs attention. |
| H01 | The compressor shut down under load, a serious outdoor unit fault. Compressor breakdown: operating frequency drops after start-up, then the unit stops. Can point to supply voltage problems or an overloaded refrigeration circuit. |
🔴 Switch the system off at the isolator and call us, running it risks further compressor damage. |
| H02 | The compressor is jammed and can't start. Compressor lock, over-current detected at compressor start-up; can also indicate a wiring (open phase) fault. |
🔴 Switch off at the isolator and call us. This one needs a technician before the unit runs again. |
| H03 | The outdoor unit can't measure its own electrical current properly. Current detection circuit error on the outdoor PCB. |
🟡 Book a service, this is an outdoor circuit-board fault. |
| H04 | The compressor's overheat protection has tripped. Case thermostat operation, abnormal compressor overheat. Service checks include refrigerant loss, service valves not fully open, and the expansion valve. |
🔴 Switch the system off at the isolator and call us, it can indicate refrigerant loss. |
| L03 | Two indoor units both think they're the group leader. Duplicated indoor group master unit, addressing/commissioning issue. |
🟡 Book a service, grouping needs to be re-commissioned. |
| L07 | A stand-alone indoor unit has group wiring connected to it. Group cable connected to an individual (non-grouped) indoor unit. The system re-enters address setup automatically if grouping is wrong at power-on. |
🟡 Book a service, this is an installation setup issue that needs a technician. |
| L08 | The indoor units haven't been given their group addresses yet. Indoor group address unset, commissioning incomplete. |
🟡 Book a service so the addressing can be completed. |
| L09 | The indoor unit doesn't know its own capacity setting. Indoor capacity unset, a commissioning DIP-switch/setting on the indoor board. |
🟡 Book a service, a technician sets this on the indoor unit's board. |
| L10 | The outdoor unit's replacement circuit board hasn't been set up for this model. Unset jumper / model type on the outdoor service PCB. |
🟡 Book a service, the outdoor board needs its model setting completed. |
| L20 | Two units on the central control network share the same address. Duplicated central control system address (TCC-LINK / network adaptor setting). |
🟡 Book a service, the central-control addressing needs correcting. |
| L29 | Circuit boards inside the outdoor unit have stopped talking to each other. Communication error between outdoor MCUs (main board and inverter boards). |
🟡 Book a service, this is internal to the outdoor unit's electronics. |
| L30 | An external safety device wired to the unit has told it to stop. Outside interlock input, abnormal stop signalled by external equipment connected to the indoor unit. |
🟡 Book a service. If you know an external system (e.g. building safety interlock) is connected, mention it when you call. |
| P01 | The indoor fan motor has a fault. Indoor AC fan error. |
🟡 Book a service, fan motor faults need a technician. |
| P03 | The compressor is running too hot at its outlet. Discharge temperature (TD) exceeded its limit. Service checks include refrigerant loss and the electronic expansion valve. |
🔴 Switch the system off at the isolator and call us, this can indicate refrigerant loss. |
| P04 | Pressure inside the system climbed too high and it shut itself down for protection. High-pressure system error, refrigeration circuit overload, coil sensor or high-pressure switch. |
🔴 Switch off at the isolator and call us. It's fine to check that filters are clean and the outdoor unit isn't blocked by leaves or objects, but don't keep running it if the code returns. |
| P05 | The power coming into the unit isn't right. Power supply error, supply voltage out of range or a phase problem. |
🟡 If the whole property just had a power event, try one power-cycle at the isolator (wait 20-30 minutes). If the code returns, book a service. |
| P07 | The outdoor unit's power electronics got too hot. Heat sink overheat, inverter heat sink exceeded its temperature limit; service checks include heat-sink mounting and airflow path. |
🟡 Make sure the outdoor unit has clear space around it and isn't blocked, then book a service if the code returns. |
| P10 | The indoor unit found water where it shouldn't be, the condensate isn't draining away. Overflow detected, float switch tripped in the drain pan. |
🟡 Book a service promptly, a blocked drain can leak into the ceiling or wall if the unit keeps running. |
| P12 | The indoor fan motor has a fault. Indoor DC fan error, over-current, locked rotor or position-detection fault. |
🟡 Book a service, the fan motor or its drive board needs a technician. |
| P15 | The system thinks it has lost refrigerant. Gas leak detection, discharge (TD) or suction (TS) temperatures above their limits. Service checks include leak testing, service valves and the expansion valve. |
🔴 Switch the unit off at the isolator and call us, don't keep running a system that may be low on refrigerant. |
| P19 | The valve that switches the system between heating and cooling isn't working properly. 4-way (reversing) valve system error, detected when the indoor coil temperature moves the wrong way after heating starts. |
🟡 Book a service, the reversing valve needs a technician. |
| P20 | The system shut itself down to protect against high pressure. High-pressure protective operation, causes include blocked airflow over the coils, dirty heat exchangers, closed service valves or refrigerant overcharge. |
🔴 Switch off at the isolator and call us. Checking that filters are clean and the outdoor unit is clear of obstructions is safe; repeated running against this fault isn't. |
| P22 | The outdoor fan system has a fault. Outdoor fan error, fan motor lock, supply voltage or fan drive board. |
🟡 Check nothing is jammed against the outdoor unit, then book a service. |
| P26 | A short-circuit was detected in the compressor's drive electronics. Inverter Idc protection, short-circuit fault in the compressor driving element or compressor windings. |
🔴 Switch the system off at the isolator and call us, this is an electrical fault that needs a technician. |
| P29 | The outdoor unit can't sense the compressor motor's position. Position detection circuit error on the compressor drive. |
🟡 Book a service, this sits in the outdoor unit's drive electronics. |
| P31 | This unit stopped because another indoor unit in its group has a fault. Follower unit stopped by a warning from the group master (master shows E03, L03, L07 or L08). This unit itself is usually fine. |
🟡 Check the other indoor units' controllers for a different code and book a service quoting that code too. |
TCC-LINK central control (used with RAV / VRF systems) — codes shown on the central controller, not the room controller
Where the code shows: Central controller display. The manual notes the same underlying fault can show different codes depending on which device detects it..
| Code | What it means | What to do |
|---|---|---|
| C05 | The central controller can't send commands onto the control network. Central control system communication (send) error, can also indicate duplicated central control devices on the network. Units keep running under their own controllers. |
🟡 Individual units should still work from their own controllers, book a service for the central control system. |
| C06 | The central controller can't receive replies from the control network. Central control system communication (receive) error, network wiring (U3/U4 terminals), adaptor board or termination resistance. |
🟡 Book a service, the central-control connection needs a technician to check it. |
| C12 | A device wired into the general-purpose control interface has reported a fault. Batched warning from equipment connected via the TCC-LINK/general-purpose device control interface. |
🟡 Book a service and mention any third-party equipment connected to the air conditioning controls. |
| P30 | One of the units in a controlled group has its own fault. Group follower unit defective, reported at the central controller; the affected unit's own controller shows the specific code. The same code can also indicate duplicated central control addresses (shown with L20). |
🟡 Check each unit's own controller for its code and book a service quoting what you find. |
RAS residential hi-wall inverter splits (service manual SVM-10050-1)
Where the code shows: No code shows in normal use. When a fault is logged, all lamps on the indoor unit flash together about 5 times a second and the unit beeps for 10 seconds. A technician reads a two-character check code (range 00-33, letters shown as 7-segment characters) through the remote controller's hidden service mode (CHECK button); '7F' on the display just means the fault memory was cleared, not a fault..
| Code | What it means | What to do |
|---|---|---|
| 04 | The indoor and outdoor units have stopped talking to each other. Serial signal error between indoor and outdoor units, connecting cable, inter-unit wiring or a signal circuit on either board. The outdoor unit won't start while this is active. |
🟢 Switch the system off at the isolator, wait 20-30 minutes, then switch it back on. If the fault indication returns, book a service. |
| 07 | The outdoor unit went quiet mid-run, often the compressor protecting itself or low refrigerant. Return serial signal stopped during operation. Causes listed: compressor thermal cut-out, gas shortage/leak, or a momentary power failure. |
🔴 If this appeared straight after a power interruption, one power-cycle at the isolator (with a 20-30 minute wait) is fine to try. Otherwise switch the unit off and call us, it can mean low refrigerant. |
| 08 | The valve that switches the system between heating and cooling is working in reverse. 4-way (reversing) valve inverse error: the indoor coil temperature (TC) moves the wrong way after heating starts. The unit keeps operating. |
🟡 Book a service, the reversing valve needs a technician. |
| 0C | The room temperature sensor has failed. TA sensor short-circuit or disconnection. The unit keeps operating. |
🟡 The unit may keep running but can't read the room properly, book a service. |
| 0d | The indoor coil's temperature sensor has failed. TC (indoor heat exchanger) sensor out of place, disconnected or short-circuited. The unit keeps operating. |
🟡 Book a service, the sensor needs refitting or replacing. |
| 11 | The indoor fan motor has a fault. Fan motor failure, locked rotor, short-circuit or disconnection, or its drive circuit on the indoor board. |
🟡 Book a service, fan motor faults need a technician. |
| 12 | A fault on the indoor unit's circuit board. Other indoor PCB trouble, board replacement is the listed remedy. |
🟡 Book a service. |
| 14 | The inverter tripped on a sudden current spike. Inverter over-current protective circuit operated (short-time). Outdoor unit stops. |
🟡 Book a service, repeated trips point at the outdoor electronics or compressor. |
| 16 | The compressor drive can't sense the motor, possibly a short inside the compressor. Position-detect circuit error or short-circuit between compressor windings. Remedy path: PCB or compressor replacement. |
🔴 Switch the unit off at the isolator and call us, don't keep restarting it. |
| 17 | The outdoor unit can't measure its own electrical current properly. Current-detect circuit error on the outdoor board. |
🟡 Book a service, this is an outdoor circuit-board fault. |
| 18 | An outdoor temperature sensor isn't reading properly. Outdoor heat exchanger sensor (TE) or suction sensor (TS) out of place, disconnected or short-circuited. |
🟡 Book a service. |
| 19 | The sensor watching the compressor's outlet temperature has failed. Discharge temperature sensor (TD) disconnected or short-circuited. |
🟡 Book a service. |
| 1A | The outdoor fan system has a fault. Outdoor fan drive error, position-detect fault, over-current protection or fan lock. |
🟡 Check nothing is jammed against the outdoor unit, then book a service. |
| 1b | The outdoor air temperature sensor has failed. Outdoor ambient sensor (TO) error. The unit keeps running, and the doc notes this fault isn't shown on the indoor lamps. |
🟡 The system keeps working but may behave oddly in extreme weather, book a service. |
| 1C | The compressor isn't responding to its drive electronics. Compressor drive output error, compressor lock or a missing phase in its wiring. |
🔴 Switch the unit off at the isolator and call us. |
| 1d | The compressor won't turn. Compressor does not rotate, current protection doesn't engage in the expected window after start-up. |
🔴 Switch the unit off at the isolator and call us, repeated start attempts can make it worse. |
| 1E | The compressor ran dangerously hot. Discharge temperature exceeded 117 degC. Service checks include the TD sensor, refrigerant leakage and the expansion valve. |
🔴 Switch the system off at the isolator and call us, this can indicate refrigerant loss. |
| 1F | The compressor has failed, a major outdoor unit fault. Compressor breakdown. Service checks include supply voltage (220-240 V +/-10%) and refrigeration-cycle overload, including a short-circuited outdoor airflow path. |
🔴 Switch the unit off at the isolator and call us. |
Code still showing after a reset? Mention the code and your system type when you book and our office can line up the right technician and likely parts before we arrive.
Book a service or call (02) 4760 0100 (24-hour line, Penrith & Blue Mountains).
Codes vary between models and generations, and manufacturers revise them. This guide is compiled from official service documentation and checked by Ample Air, but it is general information, not a diagnosis. Refrigerant and electrical work must be carried out by licensed technicians. Ample Air, ARC licences AU12976 & AU15788. Last verified August 2026.