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Msd2758drq defrost timer or advanced defrost control board

Trying to determine which my refrigerator has...

Posted by Anonymous on


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: Freezer/refrigerator compressor running constantly

th ebi-metal is a thermostat which shuts the defrost heater on/off, but doesnt actually put the unit into defrost. if it were bad the defrost heater would never go on resulting in massive build up of ice on back wall of freezer, and noticable refrigeration sect. cooling.. dont know how you know the compressor never shuts down, but if that the case perhaps you have a sealed system/ freon issue. try removing the back panel of freezer section and check the evaporator coil. you shuld have an even frost pattern over the entire evap coil. if theres just frost over the top 1or 2 coils, and the rest of coil is shiny aluminum , thats an indication of a sealed system issue.( 5 year part warr by manufacture) def not a do it yourself issue...but that would,, depending on extent of restriction/loss of freon,, cause freezer to freeze and defrost eratically,and the compressor would be running constantly trying to achieve a good stable temp

Posted on Apr 02, 2008

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SOURCE: trouble shooting defrost system

you can not manually start a defrost cycle
go to the freezer and check the heater and bimetal they are in the evaperator coil if these parts check good then replace the adaptive defrost control

Posted on Apr 25, 2008

  • 1 Answer

SOURCE: defrost timer board for mzd2766geq

Defrost control board is in the top of the refrigerator behind the two levers that control the temperature. You have to take off the plastic cover. There are two screws and then you slide to cover to the side to remove. The board is in a white plastic housing.

Posted on Aug 25, 2008

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SOURCE: Maytag PBF 2255 HEW refrigerator defrost timer location?

These look like schematics that might help you.

Posted on Dec 27, 2008

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SOURCE: Refrigerator

My Haier wasn't defrosting right, ice would build up & the freezer would be fine but the fridge temp not right. After reading lots of posts, defrosting a few times,etc., I took advice & ordered a new defrost timer. (Repair Clinic) They had diagrams that showed where things are. This is everything I did. Unplugged it, cleaned off everything in back, double checked fans were all working, drain pan draining, in freezer took off panels to make sure ALL ice buildup was melted including drain hole. Made sure everything was connected (there is sensor w/clip that could be near or on the condensor coils & it wasn't on - so I made sure it was on) - dried things, put back together. Changed the defrost timer. Plugged back in. Two weeks have gone by and things are just fine! You definitely need to completely defrost the fridge because even if the defrost timer is the problem all the ice built up won't allow the fridge to defrost in the defrost cycle. You'll want a fresh start & it's worth it! I thought we were going to have to buy a new fridge! And my husband is proud that I did the trouble-shooting & repair all by myself! Thanks to all the help I found online!

Posted on Dec 10, 2009

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1 Answer

Defrost timer

The defrost timer is part of the electronic control baord located on the back of the refrigerator. If the freezer is not defrosting check the thermistor on the evaporator(freezer) coils. It can cause the control board to thing it doesn'y need defrosting. a common problem

Mar 22, 2014 | Kenmore Side by Side Refrigerator

1 Answer

Defrost Timer

Probably a control Board problem. Without model #, I can't say for sure, but your fridge probably has a defrost board and not a timer.

Sep 05, 2017 | LG LRFC22750ST French Door 22.4 Cu. Ft....

1 Answer


for several years now that brand hasnt useda defrost timer yet instead a adaptive defrost control which could be found in the ref control panel to the extreme right side,it is a solid state control which cant be advanced manually into deforst such as the old style timer could be, only way to determine what is bad is check that the defrost heater(most commen defrost problem) is bad or if the defrost t-stat is bad if both of those is good then the defrost control is bad,once again i stress that the most common problem it that the defrost heater is broke

Jul 18, 2011 | Refrigerators

1 Answer

Defrost system not working


A mechanical defrost timer controls the defrost cycle of the freezer. In older models, the timer runs continuously and roughly every six hours, cuts power to the cooling system and sends power to the defrost heater. In newer models the timer advances only while the compressor or defrost cycle is running - an improvement for efficiency. As the timer continues to advance, power to the heating element is cut and power is restored to the cooling system. If the timer does not advance, the appliance will be stuck either in defrost or refrigerate mode, resulting in, respectively, no cooling or frost build-up.

The defrost timer is usually found behind the front grill "toe kick" of the refrigerator. It may also be found behind a cover plate inside the refrigerator or freezer, in the temperature control console, or behind the refrigerator near the compressor. To test whether the defrost timer is simply failing to advance, locate the advance screw and turn it clockwise until you hear it click. This advances it to the next mode. If it was cooling before, it is now in defrost mode. Simply wait about 35 minutes and check whether it has left defrost mode and has resumed cooling (listen for the compressor). If it does not advance, the timer motor is probably bad and the entire timer needs to be replaced. If it advances as it should, then you can follow the steps below to test the switch electrically.
The timer is usually held in place with one or more screws. Remove the screws and gently pull the timer out far enough to disconnect the wiring connector. The connector can be removed by firmly pulling and rocking it left and right. It is not necessary to note the position of the wires because the connector plug is keyed so that it can be replaced in only one way.

Take care.

Aug 25, 2010 | GE Refrigerators

1 Answer

Is the ge tbx19 defrost clock continious or cumulative?

The timer will advance whenever the cold control is on. (when the compressor is running, or the timer has advanced into a defrost cycle) When the refrig is cold enough (and the timer has not advanced into defrost) the timer will not be advancing. A typical defrost timer will count up 8 hours of compressor run time before going into a 30 minute defrost cycle. (the run time and defrost time can vary greatly from model to model)

Jun 16, 2010 | GE Profile 19.0 cu. ft. Top Freezer...

1 Answer

How do i advance the defrost timer

You don't have a defrost timer, you have a mother board probably on the back of the unit. It determines when to defrost based on the usuage of the unit.
you can force defrost with a jumper from J11 to J9, then monitor current. Assuming fridge is freezing , this should supply current to defrost coils. If not working, you have a bad heater or defrost thermostat. If this works, you have a bad mother boar

Sep 04, 2009 | GE GSS20IEPWW / GSS20IEPCC Side by Side...

1 Answer

Subzero 590: small upper fan inside the refrigerator not working

The fan circulates the cold air accross the evaporator to distribute the cold air around the fridge. It appears that your defrost system isn't working since you have ice buildup. You have a defrost heater and defrost thermostat and timer or motherboard which need to be checked to determine the problem. How to check everything

check defrost timer, defrost heater, defrost thermostat. In most newer models the timer has been replaced by an electronic control board. If the heater and thermostat are ok it’ll be the control.

You can turn the defrost timer till it clicks and everything shuts down. The heater should now come on. If it does, replace the timer. If it doesn't, check the heater and defrost thermostat. Turn the timer again till everything starts back up to end the defrost cycle.

Aug 31, 2009 | Sub-Zero 690 Side by Side Refrigerator

2 Answers


I'll answer your question, but it's not exactly what you want to hear, so if you read any further, you have to agree not to give me a poor rating.

OK, remember the rating deal now.
On older refrigerator, you had a mechanical defrost control timer, which could be advanced by hand into defrost. The greater majority of refrigerators now use electronic boards to determine when to defrost. (part of the energy savings you get with newer refrigerators) Some brands (like LG) have a small switch on the board to put the refrig into a test cycle which will allow the advance to defrost, but most (like GE) do not have such a switch. If you have a defrost issue, the most common cause is a burnt out defrost heater, so manually putting the unit into defrost would not really help anyway. You will have to unload the freezer, remove the back wall out from inside the freezer, and melt the frost with a hair blower.

Jun 12, 2009 | GE (PSS26MSRSS) Side by Side Refrigerator

2 Answers

Ice forming on rear of freezer wall

The best way to determine what has caused a non defrosting GE electronic control model is to first access the control board. Jump terminals line power to defrost, (J4 and J9). An amp probe should be placed on this jumper wire to determine current draw of the defrost circuit. A three amp draw is what is normal for this circuit. This will eliminate checking behind the evaporator cover to determine a defective heater or over temp device (defrost terminator). Note: This test is only to check the defrost circuit. It does not initiate a defrost cycle. If the unit is in any other cycle than defrost, that cycle will continue to operate as well.

May 07, 2009 | GE (PSS26MSRSS) Side by Side Refrigerator

1 Answer

Defrost trey and drain keeps freezing and water leaks inside

Your auto defrost cycle is not functioning.    The refrig will work for a few days and then freeze up again.   You will need to determine the cause, from a defective defrost heater, defective defrost bimetal, or Defrost timer  (mechanical or electronic control board).

Mar 14, 2009 | Whirlpool GS6SHEXNL Side by Side...

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