Question about Kenmore 73502 / 73504 / 73509 Bottom Freezer Refrigerator

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Evap fan stoped running

Checked motor ,it runs fine no power is going to it, i am an hvac tech compressor is working fine, i have power at the 3 and 2 terminals on defrost control

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There is a thermostat that closes when the coil gets to a set temperature and that brings on the fan. That way the fan does not blow warm air into the refrigerator. Simular to the time delay on the blowers on high efficency unit. By the way I'm a HVAC/R Technician too. Thanks for using FixYa.

Posted on Dec 26, 2008

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Some of those fan motors will not run unil the defrost thermostat has closed.

Posted on Dec 22, 2008

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Hi, I deal with evaporator motors on a day to day basis.If the motor is running but not up to full speed, the inner windings of the motor are going out. If the motor runs as you say, is it getting only 94 volts to it? If this is the case, check the incoming voltage to the unit itself. Check to see on the schematics what is between the motor where you may be loosing your voltage. Defrost thermostat, or timer. Check power to the timer first and get back to me. The defrost thermostat supplies power to the fan when the evaporator temperature gets cold enough and the contacts will close and send power to one side of the motor. If it is going bad, it will cause you to loose part or all of the voltage. If you have a meter, check this. It is round and sealed with 2 terminals on it. If it is cold enough, you can check the leads to ground and see if you are getting less then 120 volts coming out the motor side. If so, replace the thermostat. Please keep me posted.
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HELP!!__CALLING ANY GE FACTORY TECHS


You say " all thermistors check fine " , how did you check them ? Did you check for the 5-8 DC volts at the main control board , for the thermistors ? Did you do the diagnostic check for the thermistors from the control panel ? I'm sure you know there are 5 thermistors , since the refrig has the dual evap . Possibly the # 5 is bad , since it is the freezer temp " controller " , yet if it tells the board it's not cold enough , it still sends refrigerant to the refrig evap . Since the refrig evap has 2 fan motors , can't remember if there is a damper there also . Maybe when the # 3 thermistor is satisfied , it only cuts the fans off , even though refrigerant is still going thru the refrig evap .

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Replace the motherboard (part # WR55X10942) but be careful to check that the evaporator fan (inside the freezer) turns on when you power up the refrig again. A bad evaporator fan motor can take out the motherboard. If compressor starts with new board but not evap fan, unplug immeadiatelly and replace the evap fan motor to save new board.

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Wiring problem may be a broken neutral between compressor and evap fan inside freezer, Compressor and comp fan motor runs noting else inside works.


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