Also shown as:
CH23CH26Quick answer
On Arçelik air conditioners, error code CH21 means: Inverter / compressor drive fault. No. Switch the unit off at the breaker and call an authorised technician. Running it can damage the compressor.
Can I keep using the air conditioner?
Severity: High
No. Switch the unit off at the breaker and call an authorised technician. Running it can damage the compressor.
Common causes
- Compressor or compressor drive (inverter) fault
- Unstable mains power or a loose plug/socket
- Faulty control or motor board
How to fix it
- Switch the unit off at the breaker for about 5 minutes, then switch it back on
- If the code returns, contact an authorised AC technician; don't open the unit yourself
Frequently asked questions
What does Arçelik error CH21 mean?
On Arçelik air conditioners, error code CH21 means: Inverter / compressor drive fault.
How do I fix Arçelik error CH21?
Start with these steps: Switch the unit off at the breaker for about 5 minutes, then switch it back on; If the code returns, contact an authorised AC technician; don't open the unit yourself.
Can I keep using the air conditioner with error CH21?
Severity: High. No. Switch the unit off at the breaker and call an authorised technician. Running it can damage the compressor.
Arçelik air conditioner error codes
CH01Temperature sensor (thermistor) faultCH02Pipe (coil) temperature sensor faultCH03Remote control / thermostat errorCH04Condensate drain (float switch) faultCH05Communication error between indoor and outdoor unitsCH06Pipe (coil) temperature sensor faultCH09Memory (EEPROM) errorCH10Fan faultCH29Compressor fault