Repair guide
Furnace Not Heating
If you smell gas or suspect carbon monoxide, stop using the system and contact emergency services and a qualified professional.
Symptoms
- Cool air blowing
- No heat despite thermostat demand
- Frequent short cycles
Possible causes
- Dirty filter
- Ignition issues
- Limit switch or airflow problems
Safe DIY checks
- Confirm thermostat settings
- Replace a dirty filter
- Check accessible vents are open
When to request repair help
- You smell gas
- There is soot or burning
- Carbon monoxide concerns are present
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