ecobee · Thermostat error code

Alert 1006Cooling problem

Single source High-voltage / caution

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Related diagnostic guides

Guide · Thermostat

Thermostat calls but heat or cooling does not start

Split the problem in two: is the thermostat sending 24 V on the call wire, and is the equipment responding to it? A jumper test at the board answers that in minutes.

5 steps ~40 minmoderate

Guide · Thermostat

System short cycles (turns on and off quickly)

Short cycling can be a thermostat placement or power-stealing problem, but often it is the equipment tripping on a safety (high limit, frozen coil, float switch). Watch one full cycle and see who ends it: the thermostat or the equipment.

5 steps ~60 minmoderate

Guide · Thermostat

Indoor fan won't turn off from the thermostat

Start at the thermostat: fan set to ON instead of AUTO, or a setpoint the system can never reach. If the thermostat is right, the cause is in the equipment: a stuck fan relay, a limit switch keeping the blower on, a shorted G wire or a control board fault.

4 steps ~40 minmoderate

More ecobee thermostat codes

ecobee · Thermostat

Alert 1000

Low (cold) temperature alert

Single source

ecobee · Thermostat

Alert 1001

High (hot) temperature alert

Single source

ecobee · Thermostat

Alert 1002

Sensor shut down the compressor

Single source

ecobee · Thermostat

Alert 1003

Furnace or boiler heating problem

Single source Licensed pro only

ecobee · Thermostat

Alert 1004 / 1005

Heat pump heating problem

Single source High-voltage / caution

ecobee · Thermostat

Alert 1009

Auxiliary heat running too long

Single source