I have a Goodman gas pack . The house was cold after being gone for a week . I thought it wasthe pressure switch. I replaced it with a dual purpose adjustable one. Thought i had it right but kept doing same. The same behavior is this: fires up, butshort cycles back off. The circuit board flashes three times, I reset the power and mboard flashes 2 times. It then calls for heat, the inducer motor kicks in the light goes solid and it fires up again. Then the sequence starts all over again. Sometimes the inducerwont kick on sometimes it will. About half the time the top burner will roll out and trip the roll out switch. Also, I have noticed the exhaust is stronger than what I would say is normal. Usuall i can stand it if I get a whiff, but with this one it takes my breath away and burns eyes to point I have to walk away . Usually i can turn my head for a fresh breath, but with this one I have to walk away to get fresh air. I replaced the new pressure switch with an exact replacement, so I think. It is a -0.33 wc. Im wondering if the new one could be NC vs NO ecause with the new switch it seemed to keep flashing two. The model and serial is: M: GPG1360115M41DA, S: [url=tel:1304684232]1304684232[/url] any ideas? I’m leaning towards a clogged or cracked heat exchanger. Filters changed out last month. Have not checked duct work but don’t anticipate any collapse or crushing there.

I have a coleman evcon propane furnace in a trailer. It clacks constantly as it tries to light. It sometimes takes many tries to light and the clacking continues even after it is lit. The clacking seems to be at the control module and valve. I have replaced the sensor,the ignitor,and the control module, and still keeps clacking.tried jumping across the thermostat and same thing. There is 24 to 25 volts at the valve. The unit is a coleman evcon DGAT070BDC . Have also cleaned out the heat chamber ,checked all ductwork,and all the motors are running as they should. Could this possibly be a rollout limit switch? I'm new at this and at this point am just beating my brains out trying to figure it out.