I have a Maytag gas oven that is running way too hot. Model MGR5875QDS with control board 8507P13760 rev A / 74008629.
If I set the oven at 350, it initially heats to 350 (and yes, I've verified it is 350 degrees), the relay clicks, the burner shuts off. Within about 30 seconds the relay clicks and the burner relights, runs for a minute or so, then clicks and the burner shuts off.
This sequence continues over and over, and the oven continues to get hotter and hotter and hotter. I have verified the temp sensor is good and even replaced it with a new one for good measure...to no avail.
I'm very experienced with audio circuitry but I'm a little bit of a fish out of water with active oven controls. I'd like to find out some information about the logic used to sense oven temperature and the related underlying technology used to accomplish this function. At first glance, I see a couple capacitors early in the circuit board path feeding the oven temp sensor. This makes me wonder if those caps are used to hold voltage for the oven temp sensing during the times when the burner/ignition circuit is not enabled? If I have a faulty cap, could that explain why the temp sensing circuit is giving a false (under temp) signal back to the control circuit, thus restarting the heating prematurely? Does anyone have any experience with this type of problem? Any assistance would be greatly appreciated!!!