I have a Carrier model 396JAW 036045, about 23 years old. The pilot ignites, the main burners come on for a short while, then the fan comes on and the heater acts normally. But after a few minutes the main burners shut off, with some solenoid chatter preceding the shut off. The pilot then stays lit but not the main burners. I have replaced the limit switch already.
I suspect the problem is the pilot burner/warp switch. Can anyone share with me a way to temporarily bypass the warp switch to determine if that is the problem, or to otherwise troubleshoot it? It has the Carrier Bryant Furnace 3 Wire Pilot Burner LH680005 type of module, with the yellow, green and white wires.
I have no intention of permanently bypassing something so important as the heat sensor, so don't worry about that. This is for testing purposes only.
Also, can the warp switch be cleaned or replaced without replacing the pilot too? Money is a serious concern.
Thanks for your help.