Gas Furnace Troubleshooting Tips

Furnaces need professional tune-ups regularly to ensure that it operates strongly and efficiently. However, even with regular maintenance, the furnaces can develop issues that can hinder its functioning.

In case, your furnace refuses to turn on then here are some common gas furnace troubleshooting tips you can try before calling the professionals.

Furnace Troubleshooting Tips

Check the thermostat

  • Ensure that the thermostat is set on ‘heat’ mode at a minimum of 5° above the room temperature.
  • The thermostat may be on a timer.
  • Check furnace fuse.
  • There may be a need for battery replacement but if it is powered open the thermostat and gently blow the debris and dust, which has clogged it.

No heat is generated

  • Confirm that the thermostat is on the ‘Heat’ mode.
  • Move temperature a little up and down to see if it makes a difference.
  • Check the circuit breaker that controls the furnace. Ensure that it is in the ‘ON’ position.

If neither of these works, then it is time to call the professionals because the issue is in the circuit wiring or breaker. 

Not enough heat is produced

If the furnace is performing poorly, then first check the air filter condition. It is necessary to replace the filter regularly to protect the internal components and even enhance air quality. While replacing the filters remove the furnace from the main switch.

Safety switch on the furnace door

Check the furnace door’s safety switch, if the furnace does not operate. The switch prevents the burner and fan from turning on when you remove the access panel. The door has to be closed properly for the safety switch to stay activated and furnace to operate.

Check burner flames

Contamination or soot on the burners can cause the furnace to stop operating. Make sure they are clean and check the flames. If the flames are blue and even, the burner is clean and in case you detect yellow blazes there is possibly some dirt. Vacuum the burner and the blower region.

Pilot control or electric ignition

The gas furnace is regulated with an electric control or a pilot light, so the need for a consistent flame is not necessary. A damaged ignition system reduces performance. Clogs or drafts within the heating system can cause the pilot light to shut out.

If your furnace system is new, they may electrically ignite. Turn the power switch off and on. Inspect the heating element without touching. If you detect cracks or damage, then replace the igniter.

Check vents

Check the vents around the house to ensure nothing is blocking them. A furniture piece or a curtain may be preventing the heat flow.

Having the HVAC system inspected periodically, minor damages can be prevented into becoming a major struggle.