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How to Troubleshoot a Furnace

If you’re not sure whether your furnace is working properly, there are some things you can do to troubleshoot it. The first thing you can do is check the circuits that power your furnace. The second thing you can do is inspect the pressure switch, gas valve, and air filter.

Check the circuits that power your furnace

If you have a furnace, you need to check the circuits powering it. This will help you keep your furnace running smoothly.


If you are having trouble with your furnace, you may want to contact a professional furnace repair specialist to come out and troubleshoot. There are many things that can cause your heating system malfunction. Luckily, there are also some things that you can do to prevent these problems.

A common problem with your furnace is the blower motor becoming stuck. If this happens, the blower motor will get out of rotation and not turn on. You may be able to fix this by re-aligning the squirrel cage. If this fails, you’ll need to replace your cage.

Another problem you might encounter is a short circuit. This happens when a hot or grounded wire touches one another. If there is a short bare copper wire in the furnace, this can happen. If you are unable to locate the short bare wire, a furnace repair Mississauga professional may be able to inspect your furnace.

Check the pressure switch

If you need to troubleshoot your furnace, you can start by checking the pressure switch. This will save you both time and money over the long-term. If you are not comfortable working with this equipment, however, you should hire a professional to make the repair.

The switch is connected to a hose, so be careful not to blow directly into it. If there is any leakage, this can cause problems with the whole system.

A multimeter can also be used to check the pressure switch. You can use either a regular or jumper wire. Using a jumper wire can help you test the switch without removing the wire from the terminals.

You can also use a flashlight to check the hose port on the pressure switch. If it is clogged, you might want to remove the hose from the port and drain it.

If you have a condensing/high efficiency furnace, you might want to check the vent pipe. If the vent is blocked, the exhaust fumes can back up into your home.

Check the gas valve

Whether you’re trying to figure out why your furnace isn’t producing heat or want to know how to troubleshoot gas-fuelled heating systems, the first thing you need to do is check your gas valve. Failing to do so can cause a variety of problems, from a bad valve to an overheated furnace.

In most cases, your gas valve will be located near the bottom of your unit. It is often brightly coloured and looks like a little lever. You can try to untuck it with a wrench or use a tool kit to remove it if you accidentally close it.

By removing the wires from the gas valve, and connecting a multimeter to each terminal, you can test it. Each lead should read 24 volts. If the reading is low, the problem may be in the downstream components, or it could be a glitch in the safety circuit.

A faulty gas valve can make a clicking noise. If the clicking noise continues, it is time to replace it. This can be a dangerous and frustrating process.

Check the air filter

A quick inspection of your furnace’s filter can help you identify any problems. A furnace filter should be cleaned every 30 days or so. This helps prevent premature breakdowns and improves indoor air quality.

A dirty filter could be causing a decrease in airflow or increased noise. A dirty filter can reduce airflow, make your furnace less efficient, and make your home’s air less healthy.

Remove the front panel if you notice dust build-up around the furnace. Consider replacing the grate if the unit is older with a half-inch of hardware cloth.

You should also check for obstructions on the vents. If you live in a large house, you might want to change your air filter more frequently.

A faulty electronic ignition is another problem that you may encounter. This can be fixed by replacing your filter or checking the gas line. Do not turn the switch on if you smell gas. It’s best to call the gas company.

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