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Maytag Plus Refrigarotor have Ice Build up. Have replaced Defroster Timer but still have same problem.

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  • Santi Panya Aug 28, 2010

    Maytag Plus MDZ2752GR Refrigarator have ice build up have to blow out ice every 2 weeks. Have replaced Defroster Timer but still have same probles.

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Hi, not knowing the age and model details, I can say that you have replaced the defrost timer and this did not solve your problem. Now you will need to locate the defrost thermostat control. This is a single pole stat either with a normally open or closed set of contacts in it which works together with the timer or alone depending on the conditions. If this stat reads a temperature of lets say 23* F and the defrost timer is past its time to defrost, this thermostat will close or open its contacts to either bring on heat strips or use hot gas defrost, what ever the factory has made it to do. So, if this stat fails,all will ice up. It is normally located in the freezer compartment and is small and round with a single wire going into and back out of it, so will look as though it has 2 wires in the top of it sealed in a wax type material. It may have 2 of these stats. The way to check the stat is to cut back about 6" of the wires and it just snaps on the suction line of the evaporator coil. Take a look at the numbers on it as it will say if it is n/o or n/c contact.If you have a meter, you can check the continuity of it to see if it is opened or closed by the temperature stamped on it. If it is supposed to close for example at 25*f and you have it out in 75degree temp., it should read no continuity until it reaches its set point. This would mean it was good. If it read continuity, it would be faulty. It will have the factory readings stamped on the body of it and contact N/C or N/O so you will no by the temperature when you test it which way this contact should be in. This is a very simple way of checking these type of defrost thermostats. Make sure your evaporator fan in freezer is running up to speed also. If you still have the schematic on the box, it will show you where they are and if N/O, or N/C. Please keep me posted on this and get back to me to let me know how it came out for you. Please be kind when rating me as I know you will. I am glad to be of help to you also, and will be here in the near future at Fixya.com anytime for you on any problems.
Sincerely,
Shastalaker7
A/c, Heating, & Refrigeration Contractor

Posted on Aug 28, 2010

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Ice buildup will stop airflow from freezer to fridge, so fridge will be too warm.

My guess would be that the defroster is working half the time, allowing ice to build up. When it does work, it's got way too much ice/water to deal with, so it overflows the pan underneath.


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INSTALATION OF MAYTAG DEFROSTER TIMER


Hi, Here is a picture of the control panel where the timer is located. There is a1/4" screw holding the control panel up. Remove the screw and the control panel should release. The timer has a wire harness of 4 wires. It can only plug in 1 way.
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The defroster is not working. Ice build up prevents cold air from the freezer chest from blowing into the lower part.

The way the defroster works is this: There is a defrost timer, probably found under the refrigerator at the front, that turns on the defroster three times per day or so. That turns on a heater nested among the freezer coils. It keeps heating until the defrost thermostat gets warm; then it quits defrosting.

I think your defrost timer doesn't turn. You can turn it with a screw driver till you hear a click. Now your ice compartment should be defrosting. With ice buildup it may need lots and lots of defrosting. You might not get cooling back into the lower part for awhile, till the ice buildup melts.

By the preceding, you should know if the defrost timer needs replacing.

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