CloseTroubleshooting Hot Air Furnaces
There is no heat at all.
Your rooms aren't warm enough.
Soot collects in your house.
The blower makes unusual noises, noticeable when the burner is off.
Check for:
- The power is out.
- Broken blower belt.
- Broken blower motor.
Remedies:
- Check the fuse box/circuit breaker.
- Replace the belt.
- Call a qualified contractor.
Check for:
- Dirty filter
- Dirty registers
- Leaks in the ducts
- Dirty heat exchanger
- Blocked ducts
- Loose blower belt
- Closed register
- Duct damper in an incorrect position
Remedies:
- Replace the filter.
- Clean the registers.
- Seal the ducts with duct tape.
- Remove any visible obstructions.
- Tighten the blower belt.
- Open the register.
- Adjust the dampers.
- Call a qualified contractor.
Check for:
- Dirty filter.
- Damaged heat exchanger
- Dirty ducts
Remedies:
- Replace the filter.
- Call a qualified contractor.
- Have a professional clean the ducts.
Check for:
- Loose pulley
- Worn blower mounts
- Worn belt is worn
- Belt tension too tight
- Blower bearings need oil
Remedies:
- Tighten the setscrews.
- Put in new blower mounts.
- Replace the belt.
- Loosen the belt tension.
- Oil the bearings.
Provided by: http://www.allabouthome.com/tips/mechanical/hot_air_furnace.html