Calibrating Please Wait
Ecobee Thermostat
Severity: MinorWhat Does This Error Mean?
Ecobee shows 'Calibrating, please wait' on first power-up, after a wiring change, and any time the thermostat needs to verify how the connected HVAC system responds.
It is normal — not an error.
The screen typically clears in 1-15 minutes.
If it sits there for hours or returns repeatedly, the wiring at the C wire or the equipment terminals is the most common cause.
Affected Models
- Ecobee Smart Thermostat Premium
- Ecobee Smart Thermostat Enhanced
- Ecobee SmartThermostat with voice control
- Ecobee3 lite
- Ecobee3
Common Causes
- First power-up after install — normal calibration
- Wiring changed at the equipment or thermostat
- C wire missing or intermittent
- Heat pump reversing valve setting wrong (O vs B)
- PEK adapter wired incorrectly behind the wall
- HVAC system briefly powered off during calibration
How to Fix It
-
Wait 15 minutes.
Most calibrations complete in 1-15 minutes.
Walk away, come back.
If the screen has changed to the normal home view, the calibration finished and there is nothing more to do. -
Confirm the C wire.
At the thermostat baseplate, the C terminal must have a wire from the furnace or air handler.
Without C, the Ecobee runs on stolen power and calibration can hang.
If C is empty, you need a true C wire run or an Ecobee PEK adapter installed correctly at the equipment. -
Check breaker for the air handler.
Ecobee calibrates by sending stage signals to the equipment.
If the air handler breaker is tripped, no equipment responds and calibration stalls.
Restore power at the panel, then reboot the thermostat. -
Pull and reseat the thermostat.
Slide the Ecobee head off the baseplate.
Wait 30 seconds.
Slide it back firmly until you hear a click.
This forces a full reboot.
Calibration restarts from clean state. -
Verify equipment configuration.
On the thermostat: Settings → Installation Settings → Equipment.
Confirm the equipment type matches what is actually installed (gas furnace, heat pump, dual fuel).
Wrong equipment type makes calibration loop forever. -
Skip calibration as last resort.
On Premium and Enhanced models, the calibration screen has a Skip option after several minutes.
Tap it.
The thermostat operates with default values and you can finish setup later from the app.
Frequently Asked Questions
Will the calibration repeat itself later?
No — once finished, the thermostat does not recalibrate on its own.
If the message returns weeks later, something on the wiring side has changed (loose connection, equipment swap) or the thermostat lost power and is starting fresh.