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Thermostat not working
A faulty thermostat is often an easy, inexpensive fix. Here's what to check.
Before anything — check these
If any of these are true, stop and get professional help now:
- No display
- Won't respond
- System won't run
Safe checks you can do
Tick what you've checked. Only do homeowner-safe actions.
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 |
Recommended next action
Replace the batteries and check the settings first. If it still won't work, it may need replacing.
Plan the fix
Once you know roughly what's wrong, size the job and get a cost range:
HVAC System Planner