E4: Refrigerant system leakage or fault

E4 means the unit is reporting a refrigerant system leakage or fault. Refrigerant is not a homeowner repair. The sheet says refrigerant work needs a licensed HVAC technician, and the page marks the code pro-only. You can note E4, switch the unit off at the breaker for a few minutes, and switch it back on once. If the code returns, leave the system off and call support with the code and the model number, then schedule a licensed technician. Do not add refrigerant, open a service port, or tighten flares to chase a leak. A leak check and any recharge belong to someone licensed for that work.

What to do

1. 1Refrigerant work needs a licensed HVAC technician.
2. 2Note the code, switch the unit off at the breaker for a few minutes, then switch it back on. If the code returns, call support with the code and your model number.

Sensor, board, fan motor and refrigerant repairs need a licensed HVAC technician. Have your model number and purchase date ready when you call.