Toshiba Air Conditioner Fault Codes: Check Codes Explained

Toshiba air conditioner fault codes, which Toshiba calls check codes, are read in two ways. Wall-mounted RAS units flash their indicator lamps, and the two-character check code is read by putting the remote into service mode. VRF systems such as SMMS show a letter and number code, such as E04 or P05, on the wired remote. And 7F is not a fault: it is the code the remote shows when stored check codes have been cleared.

Toshiba's codes differ between ranges and refrigerant generations, so the same code can point to slightly different faults on an older R410A wall unit and a current R32 multi-split. The tables below come from Toshiba's own service and installation manuals, grouped by range.

At a glance

Question	Answer
What does 7F mean?	Not a fault. The remote shows 7F when the CLR button clears stored check codes in service mode
Indoor and outdoor units not communicating	04, 05 or 07 on wall units, E04 or E07 on VRF
Sensor fault	0C, 0d, 18, 19 or 1B on wall and multi-split units, F codes on VRF
Compressor or inverter fault	14, 16, 17, 1C, 1d, 1E, 1F on wall and multi-split units, H codes on VRF
Fan fault	11 (indoor fan), 1A (outdoor fan), P01 (VRF indoor fan)
How to read the code on a wall unit	Press CHECK on the remote with a pencil tip to enter service mode, then step through codes until the unit beeps and all indicators flash

Source: Toshiba service and installation manuals for RAS wall units, R32 multi-split outdoor units and SMMS, SHRM and SMMS-i VRF systems.

How to read a check code on a Toshiba wall unit

When a protective circuit operates, Toshiba's service manual for its current R32 high wall units explains that the indoor unit's indicator lamps show the type of fault in blocks. A flashing OPERATION lamp, for example, points to a power failure or an indoor PCB protection, and OPERATION and TIMER flashing together point to the connecting cable and serial signal. To get the exact check code, use the remote's service mode:

1. Press the CHECK button on the remote with the tip of a pencil to set it to service mode.
2. Step through the codes using the TIMER buttons.
3. When the displayed code matches the stored fault, the indoor unit beeps for 10 seconds and all its indicators flash five times a second. Note the two-character code on the remote.
4. Press the START/STOP (ON/OFF) button to leave service mode.

Toshiba adds that turning the power off and on afterwards returns the air conditioner to normal operation, but the check codes are not deleted from the unit's memory. Pressing CLR in service mode sends code 7F to the indoor unit and clears the stored check code, which is why 7F shows up in so many searches.

Toshiba check code list

Codes on wall and multi-split units are written as Toshiba writes them, including lower-case letters such as 0d and 1b. Older R410A RAS "N" Series codes come from Toshiba Air Conditioning UK's Technical Handbook (version 14.1.3), an older edition that is no longer online. Current R32 multi-split codes come from Toshiba's 2024 installation manual for the RAS-2M18 and RAS-3M18G3AVG-E, and VRF codes from Toshiba's quick reference for Super Heat Recovery Multi and Super Modular Multi.

RAS "N" Series wall units (R410A): check codes in remote service mode

Code	What Toshiba says it means
0C	TA sensor open or short circuit
0d	TC sensor open or short circuit
11	Indoor fan motor problem
12	Indoor PCB problem
04	Indoor to outdoor communication (includes compressor thermostat)
05	Indoor to outdoor communication
14	Inverter low voltage or short circuit protection
16	Compressor position circuit
17	Compressor current detected during off-cycle
18	TE or TS sensor open or short circuit
19	Td sensor open or short circuit
1A	Outdoor fan motor problem
1b	TE sensor fault
1C	Compressor drive circuit
07	Indoor to outdoor communication (includes compressor thermostat)
08	Indoor heat exchanger changes temperature , but in wrong direction
1d	Compressor locked rotor current protection
1E	Compressor - high discharge temperature
1F	Compressor current remains too high , after current release

Current R32 multi-split outdoor units (RAS-2M18G3AVG-E and RAS-3M18G3AVG-E)

Code	What Toshiba says it means
1C	Compressor case thermostat error / Compressor system error / Communication error between MCU / Gas pipe (unit A, B or C) temperature sensor (TGa, TGb, TGc) error
21	High pressure switch error
1D	Compressor lock
1F	Compressor breakdown
14	Driving element short circuit
16	Position detection circuit error
17	Current detection circuit error
1A	Fan system error
1E	Discharge temperature error
19	Discharge temperature sensor (TD) error
1B	Outdoor air temperature sensor (TO) error
18	Suction temperature sensor (TS) error / Heat exchanger temperature sensor (TE) error
20	PMV leakage error (unit A) / (unit B) / (unit C)

Older RAS and RAV series (Toshiba UK fault code sheet)

Code	What Toshiba says it means
00	Indoor Fault
01	Inter. Cable
03	Outdoor Fault
09	Frost Condition
0b	Indoor water level
99	No communication Indoor to Rem. Con.
21	High Pressure Trip

VRF systems: SMMS, SHRM and SMMS-i check codes

Code	What Toshiba says it means
E01	Communication error between indoor and remote controller (Detected at remote controller side)
E02	Sending error of remote controller
E03	Communication error between indoor and remote controller (Detected at indoor side)
E04	Communication circuit error between indoor and outdoor (Detected at indoor side)
E06	Decrease of No. of indoor units
E07	Communication circuit error of indoor and outdoor (Detected at outdoor side)
E08	Duplicated indoor addresses
E09	Duplicated master remote controllers
E10	Communication error in indoor P.C. B ass'y
E12	Automatic address start error
E15	No indoor automatic address
E16	No. of connected indoor units / Capacity over
E18	Communication error between indoor header and follower units
E19	Outdoor header units quantity error
E20	Other line connected during automatic address
E23	Sending error in communication between outdoor units
E25	Duplicated follower outdoor addresses
E26	Decrease of No. of connected outdoor units
E28	Follower outdoor error
E31	IPDU communication error
F01	Indoor TCJ sensor error
F02	Indoor TC2 sensor error
F03	Indoor TC1 sensor error
F04	TD1 sensor error
F05	TD2 sensor error
F06	TE1 sensor error
F07	TL sensor error
F08	TO sensor error
F10	Indoor TA sensor error
F12	TS1, TS2 sensor error
F13	TH sensor error
F15	Outdoor temp sensor misconnecting (TE, TL)
F16	Outdoor pressure sensor misconnecting (Pd, Ps)
F23	Ps sensor error
F24	Pd sensor error
F29	Indoor other error
F31	Outdoor EEPROM error
H01	Compressor break down
H02	Compressor error (lock)
H03	Current detect circuit system error
H04	Comp 1 case thermo operation
H06	Low pressure protective operation
H07	Oil level down detective protection
H08	Oil level detective temp sensor error
H14	Comp 2 case thermo operation
L03	Duplicated indoor header units
L04	Duplicated outdoor line addresses
L05	Duplicated indoor units with priority (Displayed on indoor unit with priority)
L06	Duplicated indoor units with priority (Displayed in unit other than indoor unit with priority)
L07	Group line in individual indoor unit
L08	Indoor group/Address unset
L09	Indoor capacity unset
L10	Outdoor capacity unset
L17	Inconsistency error of outdoor units
L18	FS unit error
L20	Duplicated central control addresses
L28	Over No. of connected outdoor units
L29	No. of IPDU error
L30	Auxiliary interlock in indoor unit
L31	IC error
P01	Indoor fan motor error
P03	Discharge temp TD1 error
P04	High-pressure SW detection error
P05	Phase-missing detection / Phase order error
P07	Heat sink overheat error
P10	Indoor overflow error
P12	Indoor fan motor error
P13	Outdoor liquid back detection error
P15	Gas leak detection
P17	Discharge temp TD2 error
P19	4-way valve inverse error
P20	High-pressure protective operation
P22	Outdoor fan IPDU error
P26	G-TR short protection error
P29	Comp position detective circuit system error
P31	Other indoor unit error (Group follower unit error)

On the current R32 multi-split, some codes carry more than one meaning. 1C, 18 and 20 each cover several faults, and the outdoor unit's PCB LEDs tell an engineer which one applies. That is one reason not to replace parts on the strength of the remote code alone.

What you can check safely

• Power. A flashing OPERATION lamp at power-up can mean a power failure. Check the supply and the isolator before anything else.
• Read and note the code using the service mode steps above, along with the model number from the unit's rating plate.
• Airflow. Clean the filters and make sure the indoor and outdoor units are not obstructed.
• Restart once. Turning the power off and on returns the unit to normal operation, but if the fault returns, stop there.

Toshiba's service literature is direct about the rest: ask an authorised dealer or qualified installer to install or maintain the air conditioner, because inappropriate servicing may cause water leakage, electric shock or fire, and high voltages are present inside the units.

When to call an engineer

• Any compressor, inverter or discharge temperature code, such as 14, 16, 1C, 1d, 1E, 1F or the H codes on VRF.
• Any sensor code, because the unit cannot control itself properly without that reading.
• Communication codes such as 04, 05, 07, E04 or E07 that return after a restart.
• P15 on a VRF system, which Toshiba lists as gas leak detection, and 21, the high pressure switch.

Refrigerant work needs the F gas qualifications set out by GOV.UK. Our air conditioning repair team works on Toshiba systems across London, and for multi-room or VRF installations our guide to VRF air conditioning explains how those systems fit together.

Questions people ask about Toshiba fault codes

What does 7F mean on a Toshiba air conditioner?

7F is not a fault. In Toshiba's service mode, pressing CLR on the remote sends code 7F to the indoor unit and clears the stored check code. Seeing 7F means the stored code has been cleared, not that something new has gone wrong.

How do I check the fault code on a Toshiba air conditioner?

On wall-mounted RAS units, press CHECK on the remote with a pencil tip to enter service mode, then step through the codes with the TIMER buttons. When the unit beeps for 10 seconds and all indicators flash, the code on the remote is the stored fault. On VRF systems the code shows on the wired remote.

What does 04 mean on a Toshiba air conditioner?

On RAS "N" Series wall units, 04 is an indoor to outdoor communication fault, which can include the compressor thermostat. Check the outdoor unit has power, then call an engineer to check the wiring and the outdoor unit.

What does E04 mean on a Toshiba VRF system?

On SMMS, SHRM and SMMS-i VRF systems, E04 is a communication circuit error between the indoor and outdoor units, detected at the indoor side. It needs an engineer to check the communication wiring and the outdoor unit.

How do I reset a Toshiba air conditioner fault code?

Turning the power off and on returns the unit to normal operation, but Toshiba notes the check code stays in memory. Pressing CLR in service mode clears it, and the remote shows 7F. If the fault returns, the cause is still there and needs an engineer.

Are Toshiba fault codes the same on every model?

No. Codes are similar across Toshiba's wall-mounted ranges, but meanings shift between older R410A and current R32 units, and VRF systems use a separate letter and number system. Check the code against the manual for the model on your rating plate.

Getting a Toshiba fixed

A Toshiba check code narrows the search, but on multi-split and VRF systems the outdoor PCB tells the rest of the story. Note the code, the model and when it happened, and an engineer can arrive prepared. Planned air conditioning maintenance keeps many of these faults from appearing at all.

Last updated: 4 November 2026