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Re: Why the cooling fan does not work on one the upper...
First check that the fan itself has not failed. If the fan and wiring are ok, your EOC (electronic oven control) has failed. This is NLA (no longer availabe). The Whirlpool part number is 3187895. This can be rebuilt: See: http://www.fixyourboard.com/boards/3187895.html
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The oven has internal fan at back of oven encircling the element that should get reshot when stat turned up high. Also there is cooling fan under lid to keep the wiring area cool.This should stay on for around ten - fifteen minutes after cooking finished. David "The Famous Forry"
There is a cooling fan for upper and lower oven they run at the same time no matter which oven in use it is fed from the oven manager no way to trouble shoot without pulling oven out some models use same fan for both so you could have a blower on hand remove back panels to access fans take a lead off fan to determine which one noisey
From my experience the most common reason for this failure is a thermal switch for cooling fan. It is located on the upper side between the wiring and its function is to switch off the cooling fan when the temperature drops even though the oven is already turned off. If the cooling fan does not work then it will increase the temperature on the cabinet and the main temperature limiter will switch off the oven.
When that fan starts up the air pushes against an air switch and that tells the board the fan is blowing. The stove uses a DAC system that relies on switchs to confirm the operations of the fan. the DAC control uses signal voltage to detect switch function. The air switches must physically close by air movement from the
cooling blowers before the oven proceeds into a bake or broil mode. Reason being f
the cooling motor does not function and the oven goes into a bake or
broil mode, the oven will overheat and could damage the fancy smancy over engineered piece of garbage electronic components. My opinion. This is not for the DIY unless you are a TV repairman.