ecobee

My ecobee is not powering up after installation. What could be the reason?

This article applies to all ecobee thermostats except Smart, Smart SI, EMS and EMS SI.

 

Incorrect wiring:

  • Check to make sure that your R/RC/RH wire is connected to the RC terminal

  • Check that all wires are properly inserted into the terminal blocks on the ecobee by giving the wires a gentle tug to ensure they’re securely connected

  • If you’ve installed the PEK with the ecobee3 lite or ecobee4, verify the wiring at your ecobee looks as follows:

    • R wire >> RC terminal
    • G wire >> C terminal
    • W wire >> W1 terminal
    • Y wire >> PEK terminal

  • Check the wiring on the furnace control board to ensure that your C wire is connected to the C terminal. If you’ve installed the PEK, the C wire coming off the PEK must be connected to the C terminal on the board

 

Insufficient voltage:

If you’ve verified that the wiring is correct, then there’s a good chance the issue is voltage-related. You can check the voltage yourself if you have a voltmeter; test for voltage between the RC and C wires at the ecobee—anything less than 24VAC will not power the ecobee.

  • Ensure that the power is turned on from the circuit breaker

  • Some furnaces have a safety switch that cuts off power to the equipment if the equipment cover panel is not closed properly. Please ensure the cover panel of the furnace is closed properly

  • Inspect the fuse on the actual furnace control board (typically a 3 or 5 amp fuse). A blown fuse will need to be replaced

  • If you’re not using the PEK, a short in the C wire could also be an issue (often accompanied by a clicking sound at the thermostat). Try either installing the PEK or re-purposing one of your wires as a C. If the ecobee powers on, there must be an issue with the C wire itself

 

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