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Heat only blows when fan is on

Dec.10.2009

I have a Trane unit and it is now about six years old. However, every time fall comes I have the same problem. I turn heat to auto, the flame symbol comes on, but the unit doesn't blow out. If I turn the fan to stay ON it blows heat out, but I don't like to leave the unit in the ON position because it runs continuously. What is the problem?
Mechelle, Antioch, TN

This sounds like a low voltage issue, possibly in the thermostat or on the furnace control circuit. The flame sensor may need to be cleaned as well. Flame sensors indicate that a flame is present and are part of the furnace’s safety circuit design. The flame sensor should be cleaned once a year and, at the same time, you should have a complete safety check. I suggest you contact a professional HVAC contractor, such as the ARS/Rescue Rooter branch in Nashville, TN at (615) 255-2111, and secure a Home Service Plan (HSP) inspection for your furnace.

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ARS Rescue RooterAir Conditioning, Heating, Indoor Air Quality, Plumbing, Drain Cleaning & Sewer Lines

Heat only blows when fan is on

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