Symptoms
- Screen shows 'Delay' or a countdown before running
- System doesn't start right away after a mode or temperature change
- Delay message stays on unusually long
Likely causes
- CommonNormal compressor protection delayMost systems wait a few minutes after any power interruption before allowing the compressor to restart.
- CommonRecent power outage or breaker tripAny loss of power, even brief, can trigger this protective delay.
- PossibleThermostat clock or software glitchRarely, the countdown can get stuck due to a software issue.
- PossibleFrequent short power blips from a loose wireRepeated brief power loss can make the delay seem constant.
What to do
- Wait at least 5–10 minutes, since this delay is intentional and protects the compressor.
- Check if there was a recent power outage or breaker trip in the home.
- If the delay message doesn't clear after 15–20 minutes, restart the thermostat by removing it from its base for 30 seconds.
- Check the breaker for the outdoor unit to confirm it's fully on and not partially tripped.
- If delays happen very frequently without an obvious outage, check the thermostat wiring for a loose connection causing brief power blips.
Tools and parts
- Flashlight
When to call a pro
Call an HVAC technician if the delay never clears after a restart, or if it recurs constantly without any actual power interruption.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.