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Defrost timer cant find defrost timer in motor compartment ,is it behind insulated back panel

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  • John Tripp
    John Tripp Feb 22, 2012

    Thanks for the rate Ian! JT



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  • Refrigerators Master
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Not every refrigerator has a defrost timer. Those that do will most times have it behind the controls inside fresh food campartment or just behind kickplate at front and base of refrigerator. What is your model number?


Posted on Feb 22, 2012

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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

  • 4 Answers

SOURCE: frost build up behind/inside back freezer panel

I have same problem, it usually happens after someone leaves door open too long or after 4-6 months. I usually place two frozen milk jugs full of water in the upper fridge and tape the upper fridge door closed at night before bed so the kids don't open and let the upper food get warm., Unplug the fridge and open the freezer and remove all drawers (place excess frozen food in freezer in garage) , leaving the freezer open with a towel in the bottom to catch the melting water from the back panels inside and the next morning wipe the fridge bottom clean and plug it back up and replace everything. I hate that I paid so much for this fridge and have to defrost a couple times a year. However found out too late to return back to the store. It seams like it should have a cycle that heats the back plate every so often to warm and evaporate the ice that collects, but I haven't heard or can't find anything on that.


Posted on Jun 30, 2009

  • 77 Answers

SOURCE: freezer not defrosting

you should find the defrost timer in the refrigerator section against the top of the refrigerator. Some models(not knowing what you have) have a small whole that has a slot for a flat screwdriver to go into and if you turn it, it will kick in the timer if it is stuck. Good luck

Posted on Sep 22, 2009

  • 308 Answers

SOURCE: bad defrost timer/ thermostat???

It definitely sounds like you have a bad defrost timer, that is the reason the coils are icing up on you. The next issue, which may or may not be related is the freezing of items in the refrigerator. Usually the cold air is transferred, through a vent with a damper, from the freezer and into the refrigerated section. The "thermostat" for this section is actually usually just a lever to adjust the position of the damper. That being said, usually when you have a problem such as you are having, it is either a stuck or broken damper (or damper component). Hope this helps

Posted on Nov 16, 2009

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SOURCE: kenmore refrigerator model 253.67873509 freezer

First off, go to this web site and enter your model number- it should have more letters in it than numbers (the number you provided might be a serial number, not sure):
This should give you some diagrams and parts lists.
This following web page describes your problem, and how you can fix it:
Once you get the coils defrosted, a friend of mine said if you wrap a piece of copper wire across the two evaporator coils, and connect them, the coils will not ice up. I never tried this myself, but it might be worth trying.
Good luck, and hope this helps.

Posted on Oct 02, 2010

SOURCE: my magic chef rb193p fridge wont stop running. I

I had the same problem. When the evaporator heater stops working, frost will build up until there is no air flow to the refrigerator. This will cause the refrigerator to keep running. Remove everything from the freezer and remove the pan at the bottom and see if there is a frost buildup. .... Bruce

Posted on Jul 29, 2011

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Had Er and 1f on panel. Pulled drawers out and removed ice from the back of freezer compartment, errors still show. Is there a reset button or did the ice cause a problem with fan motor?

Probably defrost problem. Evaporator, which is behind inside back wall of freezer, will have to be completely thawed. Then a determination will have to be made which of the 3 defrost components are bad. Those components are defrost heater, defrost thermostat, and defrost timer or control Board.

Sep 12, 2017 | Refrigerators

4 Answers

Ice develops at back of fridge

hi chris
dave here hope i can help

I would test the defrost timer, defrost heater or defrost limit switch

This timer activates the heater that melts frost in the evaporator for 10 to 20 minutes every 10 to 12 hours. In the process, it turns the compressor off and on. If it fails, the compressor may not run. Or the heater may not go on, eventually causing a hidden ice buildup that blocks the cold-air flow and disables the evaporator fan. An access hole lets you test the timer. If the timer isn't in the control panel, look behind the front grille or behind the rear access panel. If the compressor fails to run turn the timer until it clicks. If compressor goes on, timer is faulty. If unit isn't defrosting automatically and turning timer stops compressor or fan, timer is faulty.
Before replacing timer, spray it with electrical contact cleaner through access hole and turn it a few times. Stop just before a click and wait to see if timer advances on its own.
To replace timer, unplug the refrigerator and open control panel. Remove screws holding timer to panel and pull of leads. If wires aren't in a plug, move then one at a time to new timer.

In a frost-free unit, the evaporator coils, their fan, and the deforst heater are located behind the freezer's back wall or under its floor. The fan, which circulates cold air between the coils and the two food compartments, is controlled by the door switch, the thermostat, or both. To check the fan, open both doors, wait for the compressor to go on, and hold in the door switch. If you can't hear the fan running, test the fan(below).
The defrost heater, which melts frost on the coils, is cycled on by the defrost timer(above). If the frost melts before the end of the defrost cycle, the defrost limit switch turns the heater off. The heater may be a metal rod, a wire wrapped in foil, or a coil inside a glass tube. All are tested the same way. Test terminals for the heater are often located in the control panel or under a doorjamb; check the wiring diagram. Or test the heater leads inside the evaporator compartment.

To remove the evaporator fan, unplug unit; open back panel(or floor) of freezer. Then unscrew housing holding fan, and take off leads going to fan motor. With VOM(Volt-Ohm Meter) on RX1, probe motor terminals(except green ground wire terminal). Look for moderate resistance(50 to 200 ohms). Replace fan if much lower or infinity.

Open control panel. With VOM on RX1, probe test terminals. Look for 15-to 100-ohm reading. If infinity, turn defrost timer(as above); retest.

Trace and disconnect leads. With VOM on RX1, probe leads. Look for infinity reading when switch is warm, zero after 20 minutes in working freezer.

Hope this sources your problem
Thank you for using

Jul 20, 2008 | AEG Santo U 86000i Compact Refrigerator

1 Answer

My Maytag MBB1956GEQ

Your refrigerator appears to have a defrost problem. There are three parts tothe defrost system that may be causing the problem. The defrost timer located inside the controls panel just above the top shelf of the fresh food compartment. The defrost timer is seen as item 12 in this photo=> MBB1956GEQ_Controls Lets try to force defrost by turning the defrost time slowly clockwise until the compressor and fans stop. Leave the defrost timer like this up to 35 minutes and if the compressor and fans do not come back on automatically then the problem is the=> 67001036 Defrost Timer
If the defrost timer functions properly and still the refrigerator does not go into defrost we will need to move to the defrost heater=> 67002135 Defrost Heater Assembly

and the defrost thermostat=> 12001937 Defrost Thermostat

The defrost timer and defrost heater are found inside the back wall of the freezer and the defrost heater can be tested by the instructions found on the same page as the 67002135 Defrost Heater Assembly
If you have any questions I will be here should you need more answers, Thanks Sea Breeze

Jan 08, 2013 | Refrigerators

1 Answer

Fridge won't cool or freeze. Expert on here thinks it might be defrost timer. Asked me to pull off base front panel. Where is this base front panel....Inside the fridge or inside the freezer? Or is it...

Good day,
If it is a fairly new machine, it is located in the fresh food compartment. Usually top front center, under the plastic housing that holds the controls.
It may be a timer, but as well, could be an adaptive control, which replaced timers on many newer models.
On somewhat older models it is a timer, and is located in the fresh food compartment, in the right rear in a housing that also contains the thermostat.

If there is frost building up on the rear panel in the freezer panel, your on the right track.
There is a hole where the shaft of the timer is exposed. With the machine running, using a screw driver, turn the timer shaft clockwise until the machine shuts off. Wait 35 minutes. If the machine comes back on, the timer is O.K.
If the newer style, then there might be no access hole, which means it has an adaptive solid state control. With the machine running, unplug. Turn the thermostat to the off position. wait at least 30 seconds, 45 is better. With the machine still off, plug back in. Wait a while,(20 minutes) and look at the bottom of the panel, in the rear of the freezer panel, to see if it's starting to defrost the coils. If so, replace the control. If not replace the control, and the limit thermostat located on the top of the evaporator behind the rear panel in the freezer compartment.
This only applies to a condition of the coils in the freezer compartment icing up.

Here is a good tutorial on defrost system function.

If no frost is on the coil in the freezer compartment, then other possibilities are...
1. Fan motor behind rear panel in freezer is not running. It's a nuts and bolts replacement.
2. The cooling fan motor in the back rear of the machine, behind the cover is bad, Again, a nuts and bolts replacement.
3. Finally, the compressor is not running or the system has developed a refrigerant leak. Problems best left to a trained technician
Hope this helps.

Thanks for using FixYa

Jan 07, 2010 | Whirlpool 25.6 cu. ft. Side-by-Side...

1 Answer

After unplugging and defrosting my ge tfx20nw it

Good day,
The defrost system has failed. It is made up of a timer, defrost thermostat, and defrost heaters.
The timer is located behind the light guard in the fridge compartment.
The heaters and defrost thermostat are located in the freezer compartment, behind the back wall.
To test,
1. With the machine running, in the fridge compartment, pull off the thermostat knob, and then unclip the light guard.
The timer is behind the panel exposed, but has a hole to insert a small screw driver to advance the timer.
Turn the timer clockwise until the machine shuts off. Wait 45 plus minutes. If the machine turns itself back on the timer is good.
If not, remove the panel, and install a new timer.
2. If the timer is O.K. then the problems are in the panel on the rear of the freezer compartment.
Unplug the machine, and remove the rear panel. Allow it to defrost.
There are two quartz radiant heaters, one located on the bottom of the evaporator coil, and one half way up. There is also a defrost thermostat clipped to the top of the evaporator. It is a round disk about an inch in diameter.
Purchase and replace all 3. You may need wire nuts to splice wires together so purchase them as well, when getting the other parts.
Go slow, the heaters are easily damaged or broken if handled roughly.

Dec 15, 2009 | GE Refrigerators

1 Answer

Frigidaire FRS222GEWO--Fridge not cooling/Freezer works fine.Coil clean,fan that blows over coil working

Good day,
The defrost system is the most common problem. If you see frost on the rear panel in the freezer compartment.............then proceed.
The defrost system, is made up of 3 parts. 1.The timer, which is located either behind the kick plate (grille) on the left side, or in the fresh food campartment in the top right where the thermostat is located.
2.The defrost thermostat (by far the most common failure) which is located behind the rear panel in the freezer on top of the evaporator coil (it's a small round disk with 2 wires connected to it) and lastly.......
3.The main heater, which is located behind the rear panel in the freezer. It is a calrod unit, and wraps around the bottom of the coil, and up both sides.

With the machine running in this condition, with a screw driver, turn the shaft of the timer clockwise until the machine turns off. Leave as is. Wait 40 minutes.
If the machine turns back on, the timer is O.K. If not, replace the timer.
If the timer checks O.K., remove the back panel of the freezer and replace the defrost thermostat.
The main heater remains suspect, but I've never seen one go bad.
Your not done.
Once the repairs are complete, you must unplug the machine for 6 to 8 hours, ideally with a floor fan blowing in the freezer compartment.
Patience is your friend here. Do not rush the manual defrosting part. It's the only proper way to get all the ice melted out, and dry the compartment properly.

Here is a generic picture of how defrost systems work.
If the hyperlink does not work, copy and paste it into the address bar of your browser.

Dec 11, 2009 | Refrigerators

1 Answer

Not cold in the fridge part top freezer seem ok.

Good day,
One of 2 problems.
1. The fan motor in the freezer compartment is not running. While the machine is running, open the freezer door. You should hear the fan motor running.
If not, then remove the rear panel in the freezer section, and inspect and replace the motor if needed.
2. The defrost system failed.
When opening the freezer door, look at the rear panel. If you see the beginning of a frost build up on the panel, the defrost system has failed.

The defrost system is made up of 3 parts. The main heater, which is located behind the rear panel in the freezer panel.
The defrost thermostat which is a small round device clipped to the top of the evaporator coil, and once again, is located behind the rear freezer panel.
The timer, which is located in the fresh food compartment on the top underneath and behind control panel.
You will need an ohm meter to test the main heater for continuity, and the defrost thermostat as well.
The timer can be checked by using a small screw driver and turning the advance shaft clockwise until the machine shuts off.
Wait 35 minutes. If the machine turns itself back on, the timer is good. If not, it is bad, and needs replaced.

Here is an excellent tutorial to explain the system.

Dec 07, 2009 | Kenmore Refrigerators

1 Answer

Frigidaire FRS26ZSGRefrigerator is no longer cooling, and the freezer side has a little frost/ice at the back of the inside compartment and is about as cool as the refrigerator side should be.

Your auto defrost is not working. remove the rear assembly inside the freezer and melt any builtup ice with a hair dryer. Then check the defrost heater and the defrost thermostat. If OK then check the defrost timer located either in the fridge compartment behind the temp control or under fridge in frount behind grill. A continuity test is good for timer contacts. Heater is typ. 30 - 40 ohms. Thermostat will read short short below 35 degrees and open above 45 degrees. Timer motor winding has a series capacitor and must be tested as such. Watch out for stalled or slow running motors that look OK. PS. : QUICK TEST - The timer can be turned with a screw driver through a service access hole. With the back - of - freezer plate off turn timer till it clicks and you hear compressor turn off, this is the defrost cycle (7-10min). Use it to see if the heater is getting hot.

Jan 31, 2009 | Frigidaire FRT17G4B Top Freezer...

1 Answer

Fridge timer location



Mar 30, 2008 | Refrigerators

1 Answer

Refrigerator Running Warm

It has a defrost problem.  3 things could be the problem.  1. Defrost thermostat  2. Defrost timer  3.  Defrost heater.  The timer is in the fridge section in the middle of the console behind the controls.  On that console you will see a little hole that will give you access to the timer gear that can be turned clockwise (slowly until it clicks) to put it into defrost.  Take the back panel off in the freezer.  Once you have put it into defrost see if the defrost heater comes on behind that panel in the freezer.  If it comes on then the timer is bad.  If the heater doesn't come on then it is most likely the defrost thermostat which clips onto the evaporator behind the freezer panel.  It's less likely, but it could be the defrost heater itself but it can easily be tested with an ohm meter for resistance.  Any resistance means it's ok.  Let me know if you need further assistance.  Would appreciate a solved rating for expert advice.

Oct 17, 2007 | Kenmore 65812

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