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kg321 01-07-2008 11:49 AM

furnace turns off after 3 min
carrier unit. error code 33. burners come on for 3-4 min then cuts off.
sanded iginiter, checked limit switch, checked relay, duct work not blocked, filte clean, blower motor seems to be working properly. Any ideas? circuit board maybe? Any help would be appreciated.

HvacWiz 01-07-2008 05:02 PM

Possibly plugged condensate drain or trap.

kg321 01-08-2008 03:31 PM

The problem was the A-coil was filthy, not enabling heat to escape, causing limit switch to kill heat, as it was sensing too hot. air mvmt/ blockage was an option but I just didn't even think about the a-coil.

bigMikeB 01-09-2008 05:37 PM

Better buy an igniter. Never touch the igniter and never sand it.

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