Symptoms
- Screen shows 'Wait', 'Starting', or similar and doesn't move on
- No heat or cool air after a long wait
- Message appeared after a mode change or power event
Likely causes
- CommonNormal startup delayMost systems briefly show a status message before beginning normal operation.
- CommonHVAC equipment not powered onIf the furnace or outdoor unit itself has no power, the thermostat can get stuck waiting for a response.
- PossibleCommunication wiring issue between thermostat and equipmentA loose wire prevents the equipment from acknowledging the thermostat's call.
- PossibleEquipment-side faultThe furnace or outdoor unit may have a fault that keeps it from starting.
What to do
- Wait a few minutes, since a brief status message during startup is normal.
- Check that the furnace switch and breaker, or outdoor unit breaker, are both on.
- Confirm the furnace or air handler access panel is fully closed, since an open panel can block startup.
- Restart the thermostat by removing it from its base or cycling batteries for 30 seconds.
- Check wiring connections behind the thermostat faceplate for anything loose.
- If the message never clears after confirming power and wiring, the equipment itself may have a fault.
Tools and parts
- Flashlight
- Screwdriver
When to call a pro
Call an HVAC technician if the wait message never clears after confirming power to the equipment and secure wiring.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.