Question about Refrigerators

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Hello, I have a model MTB2455AR in normal household use for about 9-10 years. Recently the cooling performance degraded rapidly. The frozen food started thawing and the main box went up to 50 degrees and the icemaker stopped making any ice blocks. The back of the freezer compartment was building up a layer of frost. We turned it off for a day and opened the lower back and found a lot of dust, lint, and pet hair. We cleaned off the coil and the fan and everything else we could reach easily in the lower rear of the machine. Before closing up the black fiber access panel, we plugged the refrigerator in and verified that the fan near the coil was turning. For two days we felt like geniuses and the machine seemed perfect, but the problems all returned. The kitchen has a typical ambient temperature in the 70's. Worth fixing?

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  • tom9616 Jun 25, 2009

    One of the clips holding the defrost heater had rusted and the heater tube had dropped at one end. Water got into the rubber cap on that end of the tube, corroding the electrical connection. Replacement of the heater coil and clips took care of the problem. You led me right to it. Thanks for the quick and detailed response. Tom



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the fact that you found ice on the coils at the back of the fridge means that there is a problem with the defrost system.
The defrost system ensures that coils are not icing up, and it is composed by a fan , the evaporation coil, and a defrost thermostat that start energy to the coil.
If the fan is working, then faulty parts are either the defrost thermostat or the coil.
the evaporation coil can be tested reading ohms with a multimeter, if there is infinite impedance between the two coils contacts, that means that coil must be replaced.
The thermostat is more difficult to test, and returns about 1kohms at ambient temp.
On your fridge there is also an additional 38 degrees defrost thermostat that must be tested.
Here the parts:

Defrost Thermostat
THERMOSTAT (Thermostat Order 542369 Cement)
EVAP Coil/HEAT EXCH. ASSY. 21 & 24'

Here all parts and diarams for your appliance:

Posted on Jun 17, 2009


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