Daikin Air Conditioner Error Code CJ

The CJ code means the system has detected an abnormality in the room temperature thermistor located inside the remote controller. The thermistor is either disconnected or shorted, producing a reading outside the normal range. Importantly, the system is designed to continue operating when this fault occurs, so cooling or heating is not interrupted. The code is stored in the error history for diagnostic purposes.

Clearing the error history will remove the CJ code, and this is actually the recommended first diagnostic step. If the underlying thermistor fault is still present, the code will reappear after the system runs for a short period. A code that does not return after clearing is considered a non-recurring fault and typically requires no further action.

Since the fix typically involves replacing the remote controller, the cost depends on the specific Daikin remote controller model compatible with your system. Replacement remote controllers for Daikin units generally range from around $30 to $150 or more depending on the model and whether it is a standard or advanced controller. If a technician is called to diagnose and replace the remote, labor costs will add to the total.

The first step is to clear the error code history and see if the fault returns during normal operation. If it does not return, no repair is needed. If the CJ code recurs, the remote controller unit will need to be replaced, which is a straightforward task that most homeowners can perform without special tools or technical training.

Yes, the CJ fault is classified as a non-critical error and the Daikin system is specifically designed to continue operating when this code is active. Room temperature control may be slightly affected since one temperature sensing point is unavailable, but the system will not shut down. It is still advisable to address the fault in a reasonable timeframe to restore full sensing capability.