E42 - Abnormally high current detected in compressor

What does E42 mean?

This error indicates that the compressor in the outdoor unit is drawing an abnormally high electrical current, which can lead to overheating or damage.

• Compressor overload.
• Refrigerant system issues (e.g., liquid refrigerant returning to compressor).
• Electrical issues with the compressor motor or starting components.
• Mechanical binding within the compressor.

Click steps to track your progress.

1. 1

   Turn off the main power to the AC system at the circuit breaker and allow the unit to cool down.

2. 2

   Check the outdoor unit for any signs of physical damage or unusual noises from the compressor.

3. 3

   Contact a qualified HVAC technician to diagnose the cause of the high current draw, which may involve checking refrigerant charge and electrical components.

4. 4

   Do not repeatedly attempt to restart the unit as this can cause further damage.