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Problem: I have a 4 year old Whirlpool oven range-gas. Model WFG710HOAS1
Recently, the igniter in the bake section of the oven went bad. I changed that out myself & it was all working fine again. That was over a month ago. Now my wife is telling me that after the oven PREHEATS at 350 (which is how it works all the time) when she adjusts the temperature above the PREHEAT setting, the oven temperature will start to drop. Sometimes it will work, sometimes it will start to drop.

I know the gas igniter I replaced is working as it should. So now I'm thinking that I have either a thermostat problem or a problem in the circuit board which controls all the oven functions. I don't think this oven has a mechanical type of thermostat. I think the circuit board controls everything.

Has someone out there experienced this problem & if so how difficult is it to fix it DIY. I went to Whirlpool site but can't locate any DIY repair advice. I've always had good luck with DIY repairs of Whirlpool appliances but no this time. Appreciate any help you can give me. Thanks!
 

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The place to start is measuring the voltage at the gas valve terminals when it's supposed to be calling for the burner to come on and it isn't.
 

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If it is the thermostat, I have found that some have a replaceable cheap thermostat that is separate from the temperature control and some have an integrated expensive thermostat. The expensive one usually makes replacing the whole range a better option.
 
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