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If your Toshiba high-wall air conditioner is showing unusual behaviour, flashing lights, or won’t operate as expected, it could be trying to tell you something. Toshiba air conditioning units come equipped with a self-diagnosis system that uses check codes to indicate faults.
This guide will help you understand how to use the remote control in service mode, interpret the codes, and determine the necessary next steps for repair or maintenance.

Your Toshiba air conditioner allows you to access diagnostic codes using the remote control. Here’s how:
Press the [CHECK] button with a pen or pencil to enter service mode. A “ ” icon appears on the display.
Press the [ON] or [OFF] button to start the self-diagnosis process.
The system will scan for up to 52 error codes. If no faults are found, the unit beeps once and the display changes.
If a fault is detected:
– The indoor unit beeps continuously for 10 seconds
– All indicator lamps flash rapidly (5Hz)
– A two-digit alphanumeric check code appears on the remote display
Press [START/STOP] to exit service mode when done.
To clear stored error codes, press [CLR] and send check code “7F”.
Here is a breakdown of common check codes and what each one indicates:
| Fault | Cause | Action |
|---|---|---|
| Room Temperature Sensor Fault (TA) | Disconnected, short-circuit, or failure | Check and replace sensor or P.C. board |
| Heat Exchanger Sensor Fault (TC / TCj) | Disconnected, out of place, or faulty | Inspect placement, replace sensor or P.C. board |
| Indoor Fan Error | Fan motor fault or control board issue | Check motor operation and replace board if needed |
| General Indoor PCB Fault | Internal failure | Replace indoor P.C. board |
| Fault | Cause | Action |
|---|---|---|
| Outdoor Heat Exchanger Sensor (TE / TS) Fault | Short-circuit or disconnection | Check sensors and P.C. board |
| Discharge Temperature Sensor (TD) Fault | Faulty sensor or wiring | Inspect sensor; replace if damaged |
| Outdoor Fan System Error | Fan motor or drive system issue | Replace fan motor or P.C. board |
| Outdoor Temp Sensor (TO) Fault | Faulty reading | Check sensor and connections |
| Fault | Cause | Action |
|---|---|---|
| Inverter Overcurrent | Short circuit or overload | Replace outdoor P.C. board |
| Position Detection Error | Fault in compressor windings | Replace compressor or control board |
| Compressor Does Not Start | Current not detected after startup | Check wiring or compressor |
| Compressor Drive Output Error | Severe internal fault | Check voltage, gas pressure, or replace compressor |
| High Discharge Temperature (>117°C) | Overload, gas leak, sensor fault | Check TD sensor, recharge gas, inspect P.M.V. |
| 4-Way Valve Inverse Fault | Heating error (TC sensor drop) | Check 4-way valve function |
| Fault | Cause | Action |
|---|---|---|
| Serial Signal Not Returning | Wiring issue or gas shortage | Check cable connections, inverter board, and charge level |
| Serial Signal Stops Midway | Compressor or P.C. board issue | Replace relevant board or repair wiring |
For quick error code diagnosis, we’ve built a simple troubleshooting tool, just select your error code and instantly get the details you need.
Turn off the power supply after service and restart the system to reset temporary conditions.
Permanent faults must be cleared manually using the remote (CLR → 7F).
Errors stored in the system remain in memory until cleared — even after power loss.
Toshiba Offical Manual Link: https://www.toshiba-aircon.co.uk/assets/uploads/pdf/eoi/Fault_Diagnosis_From_Infa_Red_2.pdf
Contact us and our Engineers will get it done for you!
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