A common furnace problem that plagues many homeowners is their heating system blowing cold air. Before you panic, try these 3 common fixes to get the warm air flowing throughout your home again.

Fan Setting is Set to AUTO
The furnace fan (blower) is what distributes the air throughout your home. The setting on your thermostat should be set to AUTO so that the fan only engages when the burners are on and heating the air. Sometimes, the setting can be changed to ON—where the fan runs continuously—and distributes non-heated air throughout the home while the furnace burners are off.

Furnace Filters are Dirty
Another reason for a furnace blowing cold air is a neglected furnace filter. A dirty and clogged filter can restrict airflow and cause the limit switch (a safety feature) to engage. When this switch is triggered, the burners turn off and non-heated air is circulated throughout your home. Replacing the filter should reset the limit switch and engage the burners.

Pilot Light is Out
If you have an older furnace with a standing pilot light, it may have been extinguished. Follow the manufacturer’s instructions to relight it. If the pilot light keeps going out, your furnace may have a problem with the thermocouple (temperature sensor) that will likely require replacement.

If your furnace is blowing cold air, make sure to check the thermostat setting, filter condition and pilot light. If the above suggestions don’t get the warm air flowing, you’ll need to call a professional heating technician to come and inspect your furnace. There could be a problem with the furnace’s circuit board or igniter that requires professional replacement.

Contact us today to schedule your furnace service call.

Since 1967, Fahrhall Home Comfort specialists has been providing reliable heating, cooling, plumbing and air quality service and installation to customers in Windsor-Essex & Chatham-Kent.

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