On average, a service call will cost a household $100. This may seem like chump change to some but for others it could really put a dent in their wallet. With a few precautionary measures, taking a few steps to diagnose and repair the common problems associated with a furnace can be very beneficial. Before you do so, make sure that you have been maintaining your units properly and efficiently. If you believe your furnace is broken and unable to use start here…
Troubleshooting Your Broken Furnace
- Start With the Thermostat: Make sure that the thermostat is on heat and that the setpoint is placed above room temperature. If the furnace fan does not begin to run, you have encountered your first problem.
- Is the Power On To the Furnace: It sounds arbitrary, but ensuring the power is on to the furnace is a simple mistake that people make all the time. If the fan is not running continue to check the breaker, fuse, or switch for the furnace. If the breaker was tripped, leave it off and check the furnace for loose wiring.
- Is the Pilot Light Working?: If your furnace uses a standard pilot light, make sure the flame is lit and is touching the top of the thermocouple. If the pilot is lit but the burners do no turn on, it could very well be a problem with the thermostat, control board, or limit control.
- Does the Main Burner Try and Ignite: If the main burner does not try and ignite, the flue could be clogged, furnace control board could be bad, or the limit control could be at fault. If the main burner tries to ignite and goes out, it could very well be that the flame sensor is dirty and needs to be properly cleaned.
- Do the Main Burners Turn On: Once the pilot comes on, do the main burners light? If not, ensure that gas is reaching your furnace by checking all of the manual isolation valves.
- Does the Blower Come On: If the blower does not turn on after all other troubleshooting precautions have been taken, you could have a broken capacitor or a faulty motor.