E3: Outdoor pipe temperature sensor fault

E3 means the outdoor pipe temperature sensor is reporting a fault. The code shows on the indoor display, which is why the sheet lists the location as indoor even though the sensor is on the outdoor pipe. Your check is the published reset: record E3, switch the breaker off for a few minutes, then on again. If it returns, call support with the code and your model number. This one is pro-only. Do not pull the outdoor electrical cover or disconnect sensor plugs to 'see if it clears.' A licensed technician can test that sensor. Call support if you want the code confirmed against your model before the tech visit.

What to do

1. 1Note 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.