We have the combination microwave/convection oven, and when using the convection mode, the fan does come on when the oven gets hot. When using in the microwave mode, when we are using the unit for extended times, the fan will come on as the food heats up, which also heats up the unit. The fan does turn off when the unit cools down. I think there is a thermal switch that turns on the fan when it gets hot, and if your fan does not turn off, maybe that switch has gone bad and is keeping the fan on.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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