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.
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.