Ecobee Thermostat Error Codes
Complete list of Ecobee thermostat error codes with causes and how to fix them.
AUX
π’
Ecobee Thermostat error code AUX: Auxiliary heat active.
Technician Required
E1
π‘
Ecobee Thermostat error code E1: Main board internal failure.
Technician Required
E2
π’
Ecobee Thermostat error code E2: Thermostat sensor failure.
β DIY Possible
E3
π‘
Ecobee Thermostat error code E3: Remote sensor communication error.
Technician Required
E4
π‘
Ecobee Thermostat error code E4: Furnace/AC not responding to thermostat β¦
Technician Required
EM
π’
Ecobee Thermostat error code EM: Emergency heat active.
Technician Required
SB
π‘
Ecobee Thermostat error code SB: Standby mode.
Technician Required