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Furnace not working
A furnace that won't heat usually points to a few common fixes.
Likely causes
| Cause | Likelihood | Severity | Cost |
|---|---|---|---|
| Thermostat setting | high | Low | $0–$100 |
| Clogged filter | medium | Low | $10–$30 |
| Pilot light / igniter | medium | Medium | $150–$500 |
| Blower or flame sensor | low | Medium | $150–$600 |
Safe checks you can do
- Check the thermostat is set to heat.
- Replace a clogged filter.
- Check the pilot light or igniter.
Emergency signals
- Gas smell
- Carbon monoxide symptoms
- No heat in freezing weather
Next action
Check the thermostat and filter first. If you smell gas, leave and call a pro. Otherwise, call an HVAC technician.