Carrier thermostat error code e1, e2, e4

Carrier thermostat error code e1

Carrier thermostat error code e1

The E1 code means the sensor in the thermostat is shorted or defective.

E1 means you need to replace the thermostat. Finding problems is an expensive treat, so it’s easier to buy a new thermostat.

Carrier thermostat error code e4

Carrier thermostat error code e4

The “e4” fault code means:

1. The winding resistance and the compressor’s operation current have deviated from normal.
2. The high and low pressure has deviated from normal in the running mode.
3. The coil pipe sensor indications have deviated from normal.

  1. The inserter’s contact on the circuit board is loose.
  2. There is a problem with the coil pipe temperature sensor.
  3. There is an evaporation problem in the indoor unit. Check the coil pipe temperature sensor’s indications. Not unlikely, the temperature has reached the cooling or heating levels.
  4. If necessary, clean the condenser’s surface. Dirt may prevent it from working properly.
  5. Check the outdoor motor’s and fan’s capacitance. Replace it if it is damaged.
  6. If all the above parameters and units are ok, check and, if necessary, replace the electric control board.

Carrier thermostat e2 error code

Carrier thermostat e2 error code

The e2 fault code indicates an issue with your thermostat’s return temperature sensor. It requires professional assistance. Please, address a qualified technician and have the item replaced, or the unit will not operate well.