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Wanted: furnace psychologist for chronic misbehavior.

Randy7633

Member
Joined
Oct 14, 2021
Messages
1
Location
80401
Model Number
C8MPNO75B121B1
Brand
-major brand-
Age
6-10 years
Hello Experts!

Here's the problem:

The furnace works normally except.
It starts and runs for about 7 minutes. Then, the burner shuts off and the blower continues to run. Then the blower stops and immediately, the flue fan starts, the the burner relights and the cycle continues. It cycles until the thermostat no longer calls for heat.

I don't think this is normal behavoir, but I could be wrong.

I think the blower plenum is sensing an overheat condition and is shutting down the burner but I'll let you experts tell me the real story.

Thanks!

Randy
 
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