mpdshark
Apr 27, 2012, 09:23 AM
Heil NUGK075AG01
Ser:H542 11370
Furnace starts fine then after a cycle the burners won't light but the pilot stays lit without the igniters constantly firing. Blows cold air does not shut off. Draft inducer works and main blower stays on. Pilot is blue with a bit of orange but flame sensor recognizes flame and does not keep firing the igniter like it would if it were a pilot issue.
I replaced the limit switch last fall and it ran all winter just fine. I replace the limit switch because it would not shut off last year unless you banged the switch. Different problem that was solved by new switch. I bumped it this time with no luck. Limit was set at 90 deg. Drain is clear.
Ser:H542 11370
Furnace starts fine then after a cycle the burners won't light but the pilot stays lit without the igniters constantly firing. Blows cold air does not shut off. Draft inducer works and main blower stays on. Pilot is blue with a bit of orange but flame sensor recognizes flame and does not keep firing the igniter like it would if it were a pilot issue.
I replaced the limit switch last fall and it ran all winter just fine. I replace the limit switch because it would not shut off last year unless you banged the switch. Different problem that was solved by new switch. I bumped it this time with no luck. Limit was set at 90 deg. Drain is clear.