Question about Sub-Zero 632 / S

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Freezer is not cooling, refrigerator is not cooling enough when turned on max.l

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The evaporator coil behind the cover on the back wall inside the freezer 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 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.

Posted on Nov 16, 2009

Testimonial: "Thank you very much for the detailed troubleshooting. I would not have known where to start. I appreciate you sharing your knowledge. "

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Posted on Jan 02, 2017

the dr
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SOURCE: My refigerator and freezer are not cooling enough

Is the fan in the freezer running?? Is there frost on back panel of freezer??

Posted on Oct 03, 2007

  • 1 Answer

SOURCE: sub-zero model#3211-rfd, side by side,

Have you cleaned the coil? Pop the grate off the top of the fridge and vacuum the coil as well as the grate thoroughly.

J

Posted on Sep 16, 2008

garing
  • 998 Answers

SOURCE: Freezer Working Frig not getting cold enough at max setting

unplug 24 hrs with doors open plug in again if it works better you have a defrost problem. it may be the defrost termination switch.. burned out element or bad timer

Posted on Aug 03, 2009

  • 236 Answers

SOURCE: Whirlpool Gold GD5RHAXNQ00 refrigerator not cooling properly.

It takes time for the temp to adjust(up to 24hrs) If the door is open a lot(looking into the box) or the door gasket is bad this will contribute to your problem. Are you sure the thermometer is good that you are checking the machine with. The thermistor could be bad as well(the control that senses the actual temp

Posted on Nov 03, 2009

heatman101
  • 43501 Answers

SOURCE: Frigdaire- Top freezer cold but refrigerator is not cold enough

Hi,
Check out these tips...they can help you figure out whats going wrong...

Refrigerator2_bing.gif not Cooling or Fridge not Cooling
http://www.fixya.com/support/r3662945-refrigerator_not_cooling_or_fridge_not

How to Defrost Refrigerator Defrost Timer Problem
http://www.fixya.com/support/r3771673-defrost_refrigerator_defrost_timer


Water Running in Refrigerator from Freezer2_bing.gif
http://www.fixya.com/support/r3780310-water_running_in_refrigerator_from

heatman101

Posted on Aug 12, 2010

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Related Questions:

1 Answer

How do I keep my refrig/freezer from defrosting in the winter when store in the garage.


There is only one source of cold in many refrigerators. If yours is a top freezer, then most likely it is in the freezer.
But the thermostat that you set temperature with is in the refrigerator, not the freezer.
In the cold garages, what can happen is that the refrigerator stays cold enough that it does not call for cold. So the freezer does not get enough cold.
The freezer control works by diverting cold air into the freezer WHEN THE RERIGERATOR HAS TURNED ON THE COOLING. If it is not turned on, oh well.
The best you can do for this is to put both on max cold. Then the refrigerator will call for more cold at a lower temperature, and the freezer will get it more often and will divert more when it is cooling.
This can result in the refrigerator freezing things too. You can try raising the refrigerator setting JUST A LITTLE and see if both work, but keep freezer on max cool.
This works for my situation, but ambient temperature fluctuations in the garage make this dicey. We don't put things like lettuce in the refrigerator in the garage in the winter because freezing damages them.
Good Luck

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The problem could be the fan or stat,
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Fan is blowing but the cold air in freezer is not cold enough to freeze food. Temp control has been turned up to max setting.


Hi,

Many times a freezer and/or refrigerator do not work right because of a dirty condenser coil...there are also many other things that can go wrong.


If you are hearing a clicking or buzzing then check out the last two tips.

If your refrigerator is running but warm, then...

Check out these tips that I wrote about that... it is a great place to start trouble shooting your unit...and something that you can do rather then calling a repair person to do a simple thing for you...

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heatman101

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My refrigerator is cool but cool enough and so is my freezer cool, but not cold enough to freeze anything. It seems that the motor is running.


Your refrigerator's defrost heater is not working. The frig's cooling coils are frozen up because the defrost switching unit needs replacing. It is a cheep fix. Call a refrigerator repairman and have it replaced. Max cost is around $ 100.00 mike micmor68@gmail.com
to prove this turn off refrigerator a couple of hours with the doors open and you will notice water appear on your floor as unit defrosts and it is more water than your defrost pan can hold. As it overfills it will spill over onto your floor. If you turn it back on it will work properly for about two weeks and it will start the problem again. mike micmor68@gmail.com

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Check to see if the condenser is clean. Also that the compresser is getting enough clean air.

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try it on max setting. lint clogging up stuff in the back? needs defrosting? low on refrigerant (freon)? call repairman for that last one

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