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Tips For Troubleshooting a Gas Furnace

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When your gas furnace stops working correctly, it might be due to a problem that you can fix yourself and save a lot of money. If you know the right troubleshooting procedures, you can repair most of the problems that you experience while using your gas furnace.

But proper maintenance will also be of great importance in helping you to overcome problems associated with the gas furnace.


When troubleshooting the gas furnace, the first thing you will need to do is to check the thermostat. You have to make sure that the thermostat is on heat and its set-point is above room temperature.

While diagnosing for issues, you should turn the thermostat to its highest possible setting. If the fan is not running, make sure that you turn it to the on mode.


The next thing you will need to do is to check if it has been correctly connected to power. If you turn on the fan but it fails to start running, check the breaker, fuse, or the gas furnace's switch.

If you notice that the breaker has been tripped, leave it off and then check its wiring to see if there are any lose connections. Check the control board of the furnace to see if there are any burn spots.


If they there are, you will need to replace board, and then replace the breaker.

If the breaker or fuse is functioning properly, you will need to look into the inspection window of the furnace's blower compartment. If it is working, there will be a flashing green light. If there is no light, either green or red,


then the cause of the problem is most likely to be in the thermostat, transformer, the blower motor, furnace control board or the run capacitor.

Next, you will need to check the condensate pump and make sure that the reservoir is not full. Many units have a float switch that stops the gas furnace from running if the reservoir is full.


You will also need to check the power unit for any faults and replace the pump as required.

You should also feel the inside of the furnace. If it is warm, allow it to cool before you continue with troubleshooting it. If the gas furnace has an inducer motor, make sure that it is running. If it is not, the cause of the problem is most likely to be the furnace control of the inducer motor.


Check to see if the furnace has a pilot light. The flame should be touching the tip of the thermocouple. If you notice that the light is missing, get a thermocouple replacement guide to diagnose the problems that might be affecting it.

The pilot may be lit, but the main burners fail to come on. In that case, you will need to feel the inside of the furnace.


If it is cool, the cause of the problem is most likely to be the furnace control board, the thermostat, the gas valve or limit control.

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