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Maybe this is the solution:
Symptom:
Fans Run and Heat is Produced but Burner Goes Off and On.
Solution:
This is called “cycling on the limit switch” and results from overheating in the Heat Exchanger, which causes the High Limit Switch to engage. The usual cause for this is poor air circulation through the furnace, which is a result of blockage of the Air Return or outlet Ducts. An accumulation of dust and dirt in the Heat Exchanger can also cause it. And in rare cases it may be an over-sensitive limit switch.
I guess I'll try and get some sleep now and try tackling it during daylight hours when it will hopefully be a bit warmer. Geez ....
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Hybrid Mode
