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Why Is My Furnace Blowing Cold Air

Posted On: January 20, 2017

When it’s cold outside and you turn on the furnace, you expect hot air to come through your vents. When that doesn’t happen, you may find yourself wondering what could be wrong. The team at Mountain Air is here to help you get to the bottom of your problem, but before you call us, take some time to dig a little deeper into what the problem may be.

Is the Thermostat Set Right?

You’ve probably properly set the thermostat, but it’s easy for someone to bump a button or for a child to mess with your settings. Check it to ensure it is set to heat. If it is set to heat, double check that the fan is set to “auto” rather than “on.” In “on,” the fan runs continuously even if the furnace is not engaged, and this can cause cold air to come out.

Does the Filter Need Changing?

If you’ve let your air filter go too long, it could be blocking the flow of heated air out of your furnace and into your home. Restricted air flow can also cause the safety mechanisms to kick in, turning off the burners until you address the problem. Changing the filter should fix the problem.

Is the Pilot Light Lit?

If your furnace has a visible pilot light, check it. Is it lit? If it has gone out, then you have found the source of the problem. Try re-lighting it, and then see if you continue to have problems. If it is continually going out, then you need to seek the help of an HVAC technician.

Is the Gas Supply Turned On?

Check the gas supply. Has it been turned off? If the gas isn’t running to your furnace, it cannot heat up.

Is the Ductwork Damaged?

If the ductwork has any major damage, like a large hole or leak, then your heated air may not get to the register. If the damaged duct is in the basement, attic, or crawlspace, it may actually pool cold air into your HVAC system.

Is the Condensate Drain Plugged?

For newer furnaces, which have a condensate drain line, a clog can cause the burner to shut down. These systems create water as they heat the home, and that water has to flow out of the furnace through the condensate drain. If the drain becomes plugged, it will activate a safety mechanism that will stop the burner from lighting.

Furnace Repair in Ogden, UT

If you have gone through this checklist and not come to the bottom of the problem, then it’s time to call in the professionals. Mountain Air can help you diagnose and repair your furnace problem, so you can enjoy a warm, comfortable home. Contact us today for help!