Why does my ecobee say “Calibrating: Heating and Cooling Disabled?”

This message typically indicates one of the following:
  1. Your ecobee was just installed and is running its initial calibration
  2. Your ecobee has recently rebooted and is recalibrating
The “Calibrating: Heating and Cooling Disabled” message on your ecobee’s screen is displayed after the thermostat boots up. Calibration is needed for the ecobee’s temperature sensor to get an accurate reading of your home’s temperature. This process is performed every time the thermostat reboots and usually takes anywhere from 5 to 20 minutes.
If you feel your thermostat has rebooted in error or that it is frequently rebooting, it may be rebooting due to an installation error or sudden power loss. In these cases, the thermostat will often reboot on a call for heating or cooling.
Consider the following:
  • If you are using the Power Extender Kit (PEK), ensure that the PEK is installed before any wiring splice points at the furnace. The wires coming from the ecobee should connect directly into their respective terminals in the PEK (R, G, Y, W). If there are splice points on the R, G, Y, and W wires coming from the thermostat before they enter the PEK, this may cause voltage issues.


  • If your ecobee is controlling a boiler system with zone valves, it is recommended that an external 24VAC transformer is used as a power source; a 40VA transformer may be unable to provide sufficient voltage to multiple zone valves and an ecobee at once.


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