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Evaporator fan blade jams in ice buildup

Evap fan jams in condensate drain ice build up. takes aprox 2 weeks to freeze up. condensate drain not plugged. evap coil heater element has continuity. possible defrost timer problem ?????????? no electrical diagram handy. guessing..... please help

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  • thicla01 Jun 08, 2008

    I have exactly the same problem that occurs twice. First time I've resolve it by melting the ice with a hair dryer. I'm searching for a pemanent solution.

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Check the defrost bimatal or defrost thermanstat it will be located on the evaperator suction line (large line) it should read continuity with the ref cold if it showes continuity then the defrost timer is the problem

Posted on Apr 13, 2008

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you need to have someone check the defrost circuit. if the unit does not defrost properly , ice will accumulate on the back panel where the evaporator is, blocking the evaporator fans completely, and the circulation fan will eventually stop working because the ice buildup contacts the blades all the fan motor, and eventually the refrigerator compartment will start to get warmer and warmer because there is no circulation of cool air.

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Your evaporator coils frost up in normal use and every eight hours or so the entire unit shuts down and the defrost heater comes on to melt the frost. This cycle last about 20 minutes. The melted frost drips into a drain pan and through a drain tube to the drain tray under the freezer/refrigerator where it's evaporated by the condenser fan.


Your drain tube may be stopped up with ice at the upper end because it drains too slow because it's stopped up at the lower end in the evaporator pan under the unit at the floor. It can get dust and mold in it. Once you get the ice out at the top a little pressure with a turkey baster will usually clear it out. Flushing it out with hot water and clorox may help.
Make sure it drains quick enough to prevent refreezing. . The drain should be located below the evaporator coils on the lower back of the freezer. If this repeatedly happens with yours, you may can prevent it by taking a bare copper wire and wrap it around a fin near the heater and put the other end a few inches down the drain. The heat convection may prevent it from freezing.

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The slow, easy way to fix is take out all the food, unplug the fridge, leave doors open all day. Ice will melt, and all will be fine ... for a few months, until the ice builds up again. The fast way is here.

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Could be that, or it could be the temperature sensor on the evaporator - if that goes, then as soon as the freezer starts a defrost cycle, it will think it's got the evaporator hot enough and will start cooling again.

Suggest you let the freezer thaw out then, with a voltmeter connected across the terminals on the board which connect to the sensor, turn the freezer on and see if the sensor reacts sensibly to the evaporator cooling down. It's usually done with a thermistor, but just for the moment, I can't remember whether it's usually a PTC or an NTC.

That way, if it is the sensor, you'll be spared the expense of replacing a serviceable pcb.

A.

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