Question about Maytag MTB1976HR Top Freezer Refrigerator

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Maytag refrigerator MTB1976HRW is frosting up. Where is the defrost timer located? I imagine that there is a heater coil also. Are there other possible causes? Thank you for your help.

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Your timer is inside the control panel in the fresh food compartment. #15 is defrost timer part number for yours is 68233-3 Visit. http://servicepartstec.blogspot.com/
Maytag refrigerator MTB1976HRW is frosting up. - d2dc2e1.gif

Posted on Jun 26, 2009

  • John Tripp
    John Tripp Jun 26, 2009

    Have you test your defrost timer? If not let me know.

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Maytag refrigerator not cooling and freezer has frost over coils/vents


Your refrigerator is not defrosting.
3 parts that can be contributing to your issue.
1. Defrost Timer/ Defrost board. Without knowing the model, if it is older, you have a timer, newer ones have a control board that does the same thing. Lots of maytags with the boards have issues.
2. Defrost Bimetal- found at the coils, the bimetal could be bad-cheap part.
3. Defrost Heater- least likely for a maytag to have a problem with the heater.

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I have a maytag MSD2456DEB...the freezer keeps icing over and stop cooling about every five days..any ideas


if it's ice check the drain if it's frost you have a defrost problem which is three things to check, defrost control, defrost t-stat and defrost heater

Nov 17, 2010 | Maytag MSD2456G Side by Side Refrigerator

1 Answer

My LG side by side frig. is not cold enough


Hello,

The most common fridge "not cooling" problem is a frost free failure. Remove the access panel in the freezer section to expose the evaporator coils. If the coils in the freezer section get plugged up with frost, this frost will block the evaporator fan motor from blowing the cold air around. The fan blade can also hit this frost and either become noisy or stop altogether. Locating the defrost timer can be tricky....they are often hidden behind the back bottom corners of the fridge at the bottom, in the last few years the timers have been located in the ceiling of the fresh food section, and some behind the cold control cover. Once you locate the defrost timer, slowly turn the screw like wheel in the middle of the defrost timer with a straight screwdriver until the fridge shuts off. You are now in defrost. If the defrost heater(s) comes on now, replace the defrost timer and defrost thermostat. If the heater(s) does not come on, you can ohm test the defrost heater for continuity or volt test for 120 volts to the heater(s). If you have no power to the defrost heater(s) you can also bypass the defrost thermostat to see if the defrost heater will come on, join the 2 wires together to bypass the defrost thermostat. If the heater now comes on, replace the defrost timer and defrost thermostat. If the heater itself is bad, defrost the fridge with a hair dryer, replace the defrost heater* and defrost thermostat. If the defrost timer seems "hot" to the touch or is noisy ( like a ticking or screeching noise )...replace it.

*One new safety device added to refrigerators in the last few years has been a in-line fuse added to both sides of the defrost heater. If one of these fuses let's go, you must replace the whole defrost heater, as it comes as an assembly. If the defrost heater does not work, you should check for one of these fuses being open. Check it with a volt meter or ohm meter.
On a frost free refrigerator, the cooling coils should be in the freezer section. On a SxS style refrigerator the coils will be behind a cover on the back wall. On a freezer on top style the coils could be behind the back wall or under the freezer floor. Removing the cover and exposing the evaporator coils could be a valuable tool. Seeing what the cooling coils looks like may help split your not cooling problem. Totally covered coils with white snow is a frost free problem. and the rest are bare is an indication of a system problem. System problems may be a leak in the refrigeration tubing, an inefficient not 100% pumping compressor.

Good luck


Aug 01, 2010 | LG Refrigerators

1 Answer

My fridg is not cold enough


Hello,

The most common fridge "not cooling" problem is a frost free failure. Remove the access panel in the freezer section to expose the evaporator coils. If the coils in the freezer section get plugged up with frost, this frost will block the evaporator fan motor from blowing the cold air around. The fan blade can also hit this frost and either become noisy or stop altogether. Locating the defrost timer can be tricky....they are often hidden behind the back bottom corners of the fridge at the bottom, in the last few years the timers have been located in the ceiling of the fresh food section, and some behind the cold control cover. Once you locate the defrost timer, slowly turn the screw like wheel in the middle of the defrost timer with a straight screwdriver until the fridge shuts off. You are now in defrost. If the defrost heater(s) comes on now, replace the defrost timer and defrost thermostat. If the heater(s) does not come on, you can ohm test the defrost heater for continuity or volt test for 120 volts to the heater(s). If you have no power to the defrost heater(s) you can also bypass the defrost thermostat to see if the defrost heater will come on, join the 2 wires together to bypass the defrost thermostat. If the heater now comes on, replace the defrost timer and defrost thermostat. If the heater itself is bad, defrost the fridge with a hair dryer, replace the defrost heater* and defrost thermostat. If the defrost timer seems "hot" to the touch or is noisy ( like a ticking or screeching noise )...replace it.

*One new safety device added to refrigerators in the last few years has been a in-line fuse added to both sides of the defrost heater. If one of these fuses let's go, you must replace the whole defrost heater, as it comes as an assembly. If the defrost heater does not work, you should check for one of these fuses being open. Check it with a volt meter or ohm meter.
On a frost free refrigerator, the cooling coils should be in the freezer section. On a SxS style refrigerator the coils will be behind a cover on the back wall. On a freezer on top style the coils could be behind the back wall or under the freezer floor. Removing the cover and exposing the evaporator coils could be a valuable tool. Seeing what the cooling coils looks like may help split your not cooling problem. Totally covered coils with white snow is a frost free problem. and the rest are bare is an indication of a system problem. Example picture one, example picture two, example picture three. System problems may be a leak in the refrigeration tubing, an inefficient not 100% pumping compressor.

Hope this helps...

Aug 01, 2010 | Refrigerators

1 Answer

Freezer builds up with ice


Assuming that your refrigerator is a frost free, the problem is the defrost circuit has failed. It consists of the defrost timer, heater and thermostat. The timer turns power off from the compressor and turns on the heater which melts frost on the evaporator coil. If any of the three parts fail then ice will build up.

Jul 16, 2010 | Maytag 21.0 Cu. Ft. Top-Mount Refrigerator...

1 Answer

Freezer frosts up and will not defrost itself anymore. Do I need a new defrost timer and/or thermostat? If so, where is the timer/thermostat located in the refrigerator?


It could also have a bad defrost heater. The heater and defrost thermostat are located mounted on the evaporator coil and the timer is usually mounted in the control panel with the control thermostat or in the compressor compartment.

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1 Answer

Maytag refrigerator, feezer side coil frozen and frigirator not


Defrost circuit failed, needs to be able to defrost the coils so air can pass through them thus cooling evenly. You can check the heaters located on the coils probably near the bottom back wall of the freezer with a ohm meter if you read through, the heaters are good, if you get no reading the heaters are bad. Or could be defrost timer or on newer models the adaptive defrost control which is a circuit board. If its an older model you can manually turn the timer with a screwdriver if you feel resistance, then you should replace the timer. Also in the circuit is the defrost thermostat located on the coils, this is the least expensive of the 3 components to replace. You should have a schematic located under the fridge, use this to determine which type of timer you have and for further trouble-shooting. Please let me know if this helps

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1 Answer

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If is just one spot in the whole back wall like snow ball (small) ,the unit is leaking refrigerant and the leak has to be fixed and only after that recharged.But if the back inside the freezer gets all ice up and won't defrost by itself the problem is with the defrost system ,timer ,heaters or defrost terminator.

Aug 09, 2009 | Maytag MTB1976HR Top Freezer Refrigerator

1 Answer

Refrig not cooling Freezer has frost build up on coils


Frost on the coils won't allow air to pass to the fresh food section, thus resulting in insufficient cooling. To eliminate this problem, you will have to get a new adaptive defrost timer ( small board ), and a defrost heater assembly.

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1 Answer

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This sounds like a defrosting problem. There is a defrost timer, a heater element, and a therm-o- disk thing that shuts the heater off when the frost is melted. These are the things to check, but it's usually the heater that is burnt out.

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