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F/A furnace main burners quitting mid-cycle
Greetings everyone - this is my first post on this forum.. I have what seems to be a very specific symptom: (edit: see my follow-up several posts down for an updated symptom.. I don't think this original post is accurate, or else they're both symptoms)
Sometimes during a call for heat, while the main burners are firing and everything is going fine, the main burners quit and the blower stops. The T-stat still calls for heat and the exhaust fan keeps running (forever), but it never comes back on until I cycle the t-stat (call for heat) off and on again. (What also works is cutting power to the furnace and turning back on, but that obviously doesn't narrow it down as much.)
Furnace: Heil NTC6100KFA1 (forced air)
Gas valve: Honeywell SV9502H2704
Any ideas what this could be and/or what to troubleshoot?