Question about Heating & Cooling
Hi, Silver Wings
Although there are a number of things that can cause this scenario (a "lockout"), it is usually related to an air flow problem (dirty filter, blower wheel, indoor coil, duct problem, dampers closed, return air or supply air registers blocked, etc.), a failing temperature limit switch, or is related to a flame sensing problem.
The flame sensor is easiest to check and they rarely fail. You can clean it with a scotchbrite pad and inspect it for cracks in the porcelain. Some of the air flow issues you can check, and others will require a trained technician. Testing the limit switches requires an electrical test meter and knowledge of how to use it.
If I were to make a guess based only on the information you have given me, I would be looking most closely at the air flow.
Posted on Sep 02, 2010
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Posted on Jan 02, 2017
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