With the maintenance cover open, I push the plunger button to allow the unit to cycle. Just after the LED illuminates, I see a small spark or quick glow on the control board. I would think that is or soon will be an issue. What are your thoughts?


I'd say you're correct. There shouldn't be any sparking on the board and boards just get replaced, not repaired.

Updated on January 12, 2018

Original Article:

Troubleshooting Common Furnace Problems With an HVAC Expert
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