Common Causes
- Float switch tripped (clogged drain line)
- Blown fuse on control board
- Loose wire connection
- HVAC system power switch is OFF
Step-by-Step Fix
1
Check your HVAC drain line / condensate pump for clogs.
2
Verify the HVAC power switch (usually near the indoor unit) is ON.
3
Check your circuit breaker panel.
4
Inspect wire connections at the thermostat base.
💡 Pro Tip:
Usually, this is a safety switch tripping because your AC drain line is clogged. Check the water levels in your pan first.