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Thermostat not working
A faulty thermostat is often an easy, inexpensive fix. Here's what to check.
Likely causes
| Cause | Likelihood | Severity | Cost |
|---|---|---|---|
| Dead batteries | high | Low | $5 |
| Wrong settings | medium | Low | $0 |
| Wiring issue | low | Medium | $100–$300 |
| Dead thermostat | low | Low | $100–$250 |
Safe checks you can do
- Replace the batteries.
- Confirm it's set to heat or cool.
- Check the display is working.
Emergency signals
- No display
- Won't respond
- System won't run
Next action
Replace the batteries and check the settings first. If it still won't work, it may need replacing.