If you see E1 or E, please, check the code number on the right side of the display:
23 – EIM lacks dual fuel capability. If you have fossil fuel backup heat, replace EIM. If you have electric backup heat, check and select Installer Setup Function 4 to ELECTRIC.
29 – The device is trying to connect incompatible wireless units.
30 – Invalid zone number. Set it to zero.
33 – Check Return Air Sensor wiring. If you have to remove the sensor, press and hold the CONNECT button on the EIM for 10 seconds until it starts flashing orange.
34 – Low signal. Take wireless device to a different place and try again.
38 – Make sure the “Connected” indication on EIM is flashing and you are at least feet away from EIM.
53 – The unit is not getting Outdoor Temperature and Outdoor Humidity:
This code indicates failing outdoor sensor. Check the sensor and wiring. If there are no visible faults, replace the sensor.
The 89 error code stands for “Cooling/heating unit missing”. Most likely, there is a connection problem in the wiring harness. This happens due to wires breaking, connections getting loose or units failing. Finally, a fuse in the Outside compressor unit may need to be replaced.
The 90 error code occurs when there is an issue in the thermostat module, poor connection in the air handler unit or when the circuit board goes faulty (the one where the thermostat wire connections are located).