My Furnace Won’t Heat

It can be frustrating to experience issues with your heating system, especially at a time when you need it most. Before you entirely replace your furnace system, there are a few minor issues that could be to blame. 

Below are some common reasons your furnace may not be igniting and what you can do to resolve the issue. As always, you can also contact Vanport Mechanical of Vancouver WA. Our technicians are highly skilled in residential HVAC systems and would happily inspect and repair your furnace so your family can be cozy and comfortable once again.

Make Sure the Furnace is On

It may seem silly, but have you checked that your furnace is actually on? Make sure you have the furnace’s power switch flipped to “on.” It should be inside or next to the furnace cabinet.

Look for a Flame

The first thing you should look for is a flame. If there is no flame the pilot light, or hot surface ignitor may have gone out. No flame could also be an issue with fuel supply, if you’re sure the gas is turned on there could be a problem with the gas valve itself. If you do see a flame, and the furnace is igniting you are likely experiencing another furnace issue.

Check the Thermostat

Have you checked to make sure your thermostat is turned to “heat”? If it’s on but there’s no heat, try putting the temperature 5 degrees warmer than it is currently. Your thermostat may just need to be calibrated.

Check Your Air Filter

If your air filter is clogged with debris, your furnace will not turn on. Air filters need to be replaced regularly. Depending on the filter size they need to be replaced every 3 months to 12 months.

Check the Belt

If your furnace is running but not providing heat another reason could be a broken belt. Your furnace has a belt inside that connects the motor and the blower. Turn off the power to your furnace and shut off the gas valve. Remove the door on the furnace cabinet to inspect the belt. If it does need replacing, take a look at the number that is stamped on the belt and find a replacement for it.

Pilot Light is Out

If you have a gas or oil furnace, a small flame will stay burning at all times. If the pilot light is out, the furnace won’t run. This should be the first component you look at if your furnace won’t heat. You can relight it yourself or you can contact us for help. 

In fact, if you don’t feel comfortable about performing some of the tasks we mentioned above or your furnace is still not heating or igniting, contact Vanport Mechanical. Our HVAC technicians will inspect your system, diagnose the problem, and make the necessary repairs. We are available 24/7!