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Sub zero model 361rfd freezer coils freezing up have to be defrosted manually. advise how to trouble shoot defrost heater, timer,thermostat

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  • msc92256 May 15, 2009

    Same problem here , I have to defrost the freezer coils about every 2 weeks

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5 Suggested Answers

  • 87 Answers

SOURCE: Refrigerator

Have looked at the schematics for this cabinet and am unsure as to the location of both defrost thermostats as unclear on drawings. The purpose of the defrost thermostat is to overide the heater and end the defrost cycle, once the temperature on the evaporator is high enough (normally around 0'C). If you have two then one will probably control the heaters going off and the other may well control the fan, for coming back on. I.E. once the defrost has ended the second sensor will tell the fan when the coil is cold enough to come on, this prevents heat being pushed into the main area after a defrost cycle. If you feel competent enough then I would bypass the heater thermostat temporarily and see if the heaters kick in. The other thing to check is that you have a resistance across the two ends of the defrost heater. In my experience the heater is the most likely to fail, the sensor sometimes fail and the timers rarely fail. The age of your cabinet would suggest the heaters. Please do not leave the sensor bypassed as it performs an essential role. Hope this helps.

Posted on Sep 05, 2007

refritech08
  • 149 Answers

SOURCE: defrost timer

this uses a adaptive defrost board its located in the fridge compartment in the back left side remove the cover and you'll see the adaptive defrost board if you have any questions don't hesitate to e-mail me @ hvac.tech7872pr@gmail.com

here's an URL of the diagram (copy paste link to your browser)

http://www.partselect.com/Schematics/Frigidaire/XFXTKOQX.gif

Posted on Aug 02, 2008

  • 108 Answers

SOURCE: Freezer coils freezing, fridge warm

You might want to check and make sure the interior fan is working above the evaporator coils. If the fan isn't working the air won't circulate over the evaporator and it will frost over very quickly, and also cold air won't be pushed into the fridge side.

The fan might turn off when the door is open, hold the door switch shut while you check it.

Posted on Apr 27, 2009

  • 39 Answers

SOURCE: Defrost timer might not be working

twist your defrost timer with a screwdriver clocwise till it will click and compressor shut off, check voltage on defrost heater. You should have 120volts.When wait 20 min if compressor start up back and defrost heater is off ...your timer is fine. It can come on early then 20 min....
P.S. defrost heater located on the bottom of the coil, also make sure your defrost thermostat is frozen when you going to check voltage on your heater. Thermostat located on the top of your coil.

Posted on Aug 23, 2009

  • 1218 Answers

SOURCE: I have a 20 year old sub zero side by side model

Good day,
The defrost control on that model could well have failed. If it failed in the defrost mode, then the compressor and condenser fan motor would not run.
The timer is easy enough to remove. Take it to any appliance parts house. A good counter man if you explain the machine is not running could check the contacts that run the compressor.
If it's noisy I would replace it anyway.
If they can't cross the timer, just ask for a replacement with a timing sequence of 8 hours-30 minutes. That means it will run the machine for 8 hours, then shut it off, and defrost it for 30 minutes.

The other possibility is the cold control (thermostat which is located in the fresh food compartment.
That cold control is expensive and labor intensive to replace.
Buy it only if necessary.
However, both items are popular replacement items on your machine.

Posted on Dec 21, 2009

Testimonial: "Thanks for the advice. I tested the defrost control and it is working. I believe it is the thermostat!"

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I have a mabe fridge top freeze! Lately it has being freezing to a point of building scorch and plugging the vent conduicts to the bottom!


sounds like your defrost heater is not working, there is a timer that turns on a electric coil to defrost your coils, either the timer is out or the coil is bad. take the back cover off the freezer and check the defrost coil it is usually obvious if the defrost coil is bad if its not that it is probably the timer that controls it.

Mar 19, 2014 | Sub-Zero 650 / O Bottom Freezer...

1 Answer

Frigidaire side by side model # FRS20ZRGW3 coils freeze up on freezer side, fridge side gets warm


You have a defrost timer behind the front kick plate turn it clockwise slowly until compressor and fans stop. Once this happens the timer should remain off for 30 minutes and the defrost heater should come on during the first 15 minutes. If after 30 minutes the defrost timer part=> 215846602 Defrost Timer Assembly should come out of defrost and the compressor and fans should restart, if not advance the timer clockwise until they start and replace timer. Try that first and tell me what your results are. If that is not the problem then we can narrow this down to the defrost heater=> 218657301 Defrost Heater or 5303917954 Defrost Thermostat How to test the defrost heater is found on same page as the defrost heater. If you have any questions I will be here to help you, Thanks Sea Breeze


Apr 22, 2012 | Frigidaire Refrigerators

1 Answer

I have a sub zero 361rfd. The freezer portion is no longer cooling, however the fan still runs. Also, The refrigerator is set to the coolest temperature but I suspect it's not sufficiently cold....


Hi,
Check the temperature setting Assure that there is enough room for air flow in the freezer or freezer Check for air flow restrictions in vents Test the temperature control Clean the condensor coils Check the door seals Test the door switch Test defrost heater Test defrost timer Test evaporator fan Check for a clogged drain tube Check for refrigerant leak Freezer is too cold
Check the temperature setting Test the temperature control Freezer is noisy
Hissing and popping is normal, it is the defrost heater. Check that the freezer is level Check the drain pan Check the condensor fan Check the evaporator fan Inspect the compressor mounts Freezer runs continuously
Defrost the freezer Clean the condensor coils Check the door seals Freezer starts and stops frequently
Clean the condensor coils Check the outlet voltage Test the condensor fan Test the compressor relay Test the overload protector Test the compressor motor Freezer does not defrost automatically
Test the defrost timer Test the defrost heater Test the defrost thermostat Freezer has an unpleasant odor
Remove spoiled food Clean freezer interior with a solution of h Clean freezer interior with a solution of hot water and baking soda Clean the door seals Remove breaker strips and check for wet insulation Water on floor outside of freezer
Check the drain pan If you have an ice-maker, check the water supply hose going into and coming out of the water inlet valve Water inside the freezer
Check for a clogged drain tube If you have an ice-maker, check freezer and ice-maker for level


Hoping that this will help to solve the problem....

Aug 18, 2011 | Refrigerators

1 Answer

I have a sub zero 650. Anything I put in my fruit/veggie drawer freezes and there is ice behind the drawer. It seems to be freezing around the tube behind the drawer and spreads up and out.


DEFROST PROBLEM
The evaporator coil behind the cover on the back wall inside the freezer(fridge) will ice up under normal conditions. Every 8 to 10 hours for around 20 minutes the defrost timer (or in most newer models the electronic adaptive defrost control) will turn the defrost heater on to melt the built up ice. There is a defrost thermostat which prevents the heater from overheating the freezer by breaking the heater circuit when the temp reaches close to 32 degrees F. The entire cooling system shuts off during the defrost cycle and starts back when the timer advances through the cycle.

If this ice is not melted it will continue to build up until the air can't flow over the coil to circulate the cold air through the freezer and into the fridge. The temperature change in the fridge is usually noticed first followed by the freezer.

If the defrost thermostat is bad, it can prevent the heater from coming on OR it won't turn the heater off when it gets too warm. It is clamped to the evaporator coil at the top to sense the temp. If it appears to be misshapen it is bad.
With an ohm meter it should show continuity when cold and none when warm.
You can also bypass(disconnect the two wires plugged into it and twist them together) the thermostat to see if the heater comes on then. If it does then you know the thermostat is bad and needs replaced.

The defrost heater is located on the evaporator. It is in a tube which is at the bottom and can also go up the sides of the evaporator. On some types you can see a burnt spot if it's bad. With an ohm meter it should show continuity from end to end when disconnected from the wiring in the freezer. You can also test the wiring for voltage when it's in the defrost mode.

If you have a defrost timer you can test it. It can be located under the fridge behind the kick panel on the front. Some are in the fridge with the controls at the top. 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 because that means the timer is not running. If it doesn't, check the heater and defrost thermostat. Turn the timer again till everything starts back up to end the defrost cycle.

If you have an adaptive defrost control instead of a timer, replace it if the heater and thermostat test good. It is located in the fridge with the controls in some models and on the back in others.

Mar 30, 2011 | Sub-Zero 650 / O Bottom Freezer...

1 Answer

Freezer not working but refridgerator section ok. this is a sub zero unit


It is a defrost problem since the ice that freezes on the freezer coils
is not being melted by the defrost system.
There are three components to a defrost system- a heater,heater thermostat, and a timer unless you have a defrost electronic card.
 Its best handled by a Technician butyou could possibly do it by taking your model number to the nearest appliance parts store  and asking for the parts.  They are mostly located in freezer ,behind back panel on freezer coils.except the card which is usually located in ref  The parts store will have info  Also check evaporator fan in freezer If this was helpful please rate me
IMUFO2
Leo Ponder Appliance-Tyler,Texas
imufo2@sbcglobal.net"

Sep 05, 2010 | Sub-Zero Bottom Freezer Refrigerator

1 Answer

Not defrosting replaced defrost cencer still freezing up


If the evaporator coils behind the back panel of the freezer are icing up because of auto defrost failure that will stop the circulation of cold air and eventually affect the freezer too.

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.

Sep 17, 2009 | Refrigerators

1 Answer

Freezer coils freeze up solid with ice and have to be defrosted manually


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.

How to check everything
http://www.acmehowto.com/howto/appliance/refrigerator/refrigerator.php

Aug 30, 2009 | GE Refrigerators

1 Answer

Ge frig does not freeze on freezer side


How to check everything
http://www.acmehowto.com/howto/appliance/refrigerator/refrigerator.php
If the evaporator coils behind the back panel of the freezer are icing up because of auto defrost failure that will stop the circulation of cold air

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 25, 2009 | GE (PSS26MSRSS) Side by Side Refrigerator

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

Aug 22, 2009 | Maytag MCD2257HE Side by Side Refrigerator

1 Answer

Sub zero side by side


IT MIGHT HAVE A DEFROST PROBLEM IF IT HAS A SNOW BUILD UP ON THE BACK PANEL IN THE FREEZOR THEN IT DOES CHECK DEFROST TIMER IF IT IS A CAM DRIVEN TIMER U CAN MANUALY TURN IT INTO DEFROST CHAECK TO SEE IF DEFROST HEATER COMES ON IF IT DOES BUY ANEW DEFROST TIMER

Aug 25, 2007 | Sub-Zero 690 Side by Side Refrigerator

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