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Kenmore over the stove microwave,model # 721.62629200,only low speed fan works on the keypad,no high speed fan.

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The fan has a setting for high speed, low, and off. Fan only running at low speed.This indicates problem towards. 1) the fan motor. 2) The loose fan wiring. 3) The fan switch. IN the unit there is a motor for fan.If the motor gets weak or short. The fan will run but only at low speed.Because at high speed the motor will require more power to run.In this case motor needs to be checked and replaced. The other possibility is the fan wiring.There are two wires going from fan to motor and two going from motor to power board.If any of this wire is got loose or getting short then this will stop the fan to run in high speed.In this case the wires needs to be checked and reconnected properly. In the unit there is a switch internally.When you select the fan to high speed mode the switch goes up. when you select the fan to low speed mode the switch turns down.But if the switch is faulty or got worn out.Then it will not move properly up/down.In this case switch needs to be replaced.IN some brand models the High speed and low speed are directly controlled from front control panel.There is no switch in that models.In that case the control panel needs to be checked and replaced. Thanks. keep updated for any more query.you can rate this solution and show your appreciation.

Posted on Jun 10, 2010

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