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Tom Goellner
Tom Goellner, Home Appliance Technician
Category: Appliance
Satisfied Customers: 1643
Experience:  32 yrs. experience servicing major appliances and HVAC equipment.
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maytag refridge freezer coils completely iced over within 5 ...

Resolved Question:

maytag refridge freezer coils completely iced over within 5 days. Model mtb2656deb, What components besides heater coil should I check.
I am defrosting again today. Can send photos.
I dont know where to locate the
Defrost timer control (circuit board)
Its a Top/bottom Refridge not a side by side. Approx 10 years old.
Freezer temp works fine but when it ices up I have to power off and defrost.
Submitted: 9 years ago.
Category: Appliance
Expert:  Tom Goellner replied 9 years ago.


On the ceiling of fresh food section there is plastic housing attached that has the controls - - about halfway back you'll see a small hole right above the hole is the defrost timer . You can a screw driver in there and engage the " knob " of the timer and slowly turn it clockwise until you hear " click " This will be the defrost position and the defrost heater should come on ( unless it's all ready been defrosted by you ) If it does here's the part # XXXXX which you can get from Thanks for using justanswer.

Customer: replied 9 years ago.
Reply to tom goellner's Post:

I checked the thermostat while waiting

It was 240K OHMS warm or Cold (immersed in a bag of wet ice for 10 min)

Should I replace that before trying the circuit board ?

Expert:  Tom Goellner replied 9 years ago.

If you're talking about the defrost thermostat ( it is attached to the evaporator coil ) a bag of ice is not cold enough to make it close ( needs to be about 20 degrees before it will close ) -- opens at about 60 degrees. Let your refr. again and get cold then turn the defrost timer into defrost like I previously described and see if the defrost heater get's hot - - if not then replace the defrost thermostat.

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Customer: replied 9 years ago.

I cannot see any opening for a screwdriver there.

I will remove the plastic cover and report back.

Expert:  Tom Goellner replied 9 years ago.
Yeah sometimes they put a removable plug in the hole
Customer: replied 9 years ago.

Is this the unit you mean ? Sorry its big, you may have to use the sliders or adjust your screen res to higher

rear of fresh food control system (belt driven adjust)

Expert:  Tom Goellner replied 9 years ago.

I think so ( you're right - rather large ) It will a 4 wire connector white, blue, yellow and orange wires. On one side it will have a knob that you can tuirn to put it into defrost ( the down side ) Do this and if it turns on defrost heater ( if freezer is cold enough ) then replace it.