Hello everyone, I have been reading through these forums for hours starting yesterday. Let me start with the specs, then explain with what I have done thus far. 7232 Service Manual. Comfort Maker RPJ II, it also says arcoaire on the front. Control Module is White Rodgers 50a52-111 3 Burners Electric ignitor on middle burner with flame sensor below the ignitor I dont have the PN for flame sensor on hand, I had it out yesterday and it is a white rodgers with the glass window, I want to say a radiant type. The thermostat being used is a Ebay touchscreen knockoff, has worked well the last 3-4 years, but I ordered a honeywell 5-1-1 to replace it just in case. So now onto the symptoms: #1 house is cold = unhappy wife #2 Furnace not running #3 When I turn off furnace at switch and turn back on the furnace will attempt to ignite ---1 Exhaust fan runs for about 30 seconds ---2 ignitor will glow but no ignition, ---3 ignitor will unglow and exhaust fan will run another 30 seconds ---4 ignitor will glow WITH ignition ---5 Furnace will operate for 2-5 minutes before shutting off below the thermostat desired temp. ** After Cleaning Window on Fire sensor, this is current operation** #3 When I turn off furnace at switch and turn back on the furnace will attempt to ignite ---1 Exhaust fan runs for about 30 seconds ---2 ignitor will glow WITH ignition, ---3 Furnace will operate for 2-5 minutes before shutting off below the thermostat desired temp.
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---4 Furnace will restart itself and attempt 2 trys at liting funrace (this is what control SHOULD do) ---5 ignitor will glow but no ignition ---6 ignitor will unglow and exhaust fan will run another 30 seconds ---7 ignitor will glow but no ignition ---8 ignitor will unglow and exhaust fan will run another 30 seconds ---9 Furnace shuts off. (According to the sticker on module, it will do 1 restart with 2 attempts then lockout for 3 hours) What I did yesterday was take out the flame sensor, the small black box with glass window. I cleaned the window and popped off the metal and tested the operation of the switch. With my meter hooked up it had continuity between one terminal and the next, and when the switch was activated it became an open. The other terminal of the switch worked opposite. Indicating that the switch logic is working correctly (unless of course it heating up incorrectly and making contact when it shouldn't be) I also ran resistance on the ignitor, it was in the recommended window from what I read yesterday. The control module that my furnace has does not have an LED so blinking diagnostics to help me on this one.