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1983 sub zero 241rfd with extensive ice on fridge coils and frost back of fridge drawers. Is this fridge frost free or do we need to defrost? We have defrosted by turning off fridge, but wondering what the real problem is that causes the ice to form.

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Sounds like a thermostat and a timer to me
start off with a thermostat if that doesnt work buy a timer
it's a bit expensive like 100.00 buy if you like the fridge or cant afford a new 1
thermo $10- $30
timer 30-70 try to buy recycled parts that are tested there cheeper

Posted on Jul 27, 2009

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Posted on Jan 02, 2017

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Freezer not that cold. very noisy indeed, lots of thick ice inside. should i take off the panel behind the freezer drawers, to let ice there defrost?


Yes, It needs a defrost. You will have to take out all the food, unplug it and remove all the shelves and or drawers. Remove the back panel to gain access to the evaporator coil, (make sure you have the proper screw driver or socket first). You will need some towels and a hair drier. Once inside to the coil/fan area, start with your hair drier and melt all the frost/ice out as quickly as you can. Once all is done, start looking for any wires that look out of place or burnt. Your fridge has a defrost timer and a defrost termination switch that is mounted to the coil. Look for a round metal switch that should be clipped on to one of the coils tubes. This much frost/ice build up is due to ether a bad door seal, or the fridge is not defrosting itself proper. Check all this and then put the rear panels back on. clean up the mess. Plug it back in and start it up. You will want to be sure it is cooling ok before you put all your food back in. So put a cup of water on one of the shelves and check it in about hours to see if it has started to freeze. Hope this helps Fixya up.

Apr 02, 2011 | Hotpoint FFA70 Bottom Freezer Refrigerator

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

Sub-Zero 590


Ignore the fan operation... That is perfect.

You are likely experiencing a DEFROST failure
(most commonly a defrost timer failure)...
part number 3081180 item 69 on your exploded
top view (top right side as viewed from the front).

There are typically only three (3) elements to a DEFROST
circuit:
- Defrost Timer (as noted above)

- Heater element to WARM the EVAPORATOR

- DEFROST thermostat... inhibit excess heat
(closed circuit at freezing - Opens at room temperature)

Check your defrost pan...
there should be water there DAILY...

IF not: you are assured that your DEFROST fails.

Per YOUR DESCRIPTION...
You need to look for a SUDDEN REASON (huge air leak)
why FROST would form so quickly...
USUALLY a big pizza box... BUT ANYTHING blocking a
TIGHT DOOR SEAL will cause massive frosting.

It is taking moisture from the WARM ROOM AIR and blocking your evaporator...

Yes ... all INTERIOR panels must be in place for the refrigerator to function properly.

guaranteedparts.com http://www.guaranteedparts.com/picture_library/Subzero/Subzero-500%20Series/590.pdf

Sears
http://www.searspartsdirect.com/refrigerator-repair/symptom/REF0003.html

Carnac the Magnificent

Apr 06, 2017 | Sub-Zero 690 Side by Side Refrigerator

2 Answers

My sub zero refridgerator (freezer on bottom fridge on top) is cold on the bottom of fridge and warm on the top of the fridge. Any idea what is causing this. Items are also damp in fridge. We just vacumed...


the evaporator coil inside the freezer compartment is iced over and can't transfer cold air in thes condition,remove panel inside freezer on back side of freezer compartment and thaw it out with a hair dryer,then check the defrost heating element for continuity,if its open replace it,if its good, ,check the defrost control that powers the defrost heater

Jul 15, 2010 | Sub-Zero 611 / O Bottom Freezer...

1 Answer

Fridge w/freezer on bottom will not chill


What you have is probably a bad defrost heater element is my first inclination. I would look for frost buildup on the backside of the bottom drawer. That is a sure sign of defrost failure. And most defrost failures turn out to be broken heaters. The defrost heaters mount on the evaporator coils and simply heat the area for a few seconds to melt frost. If left alone that frost will trun into snow and then into air flow blocking slab of ice and fail fresh food cooling. I have a 3 door repair manual you may want to look through just to see what you are up against. To do this repair the ice maker and all the rails drawers bins and food must come out so you can get to the rear where the evap coil and defrost heater is located.

LG FRENCH DOOR REPAIR MANUAL

Feb 14, 2010 | Refrigerators

1 Answer

Hotpoint FFA75 Fridge Frezzer. Freezer door not shuting when drawers are in but does when drawers are out. It's as if the back of the freezer has expanded.


This could indicate that your defrost cycle system is nor working and frost(ice) is building-up on the cold coil in the back of the freezer compartment. This will definitely expand the back plate and the drawers wont go in completely. You need to have the defrost system checked: either the timer, the defrodt coil, or the defrost thermostat. Goodluck, Macgivor

Jan 02, 2010 | Hotpoint FFA60 Bottom Freezer Refrigerator

3 Answers

Drain in fridge is clogged - ice formation under crisper drawers


We have cleared / de-frosted the drain twice and it keeps freezing up, causing the accumulated ice problem to recur. Should the freezer settings be changed?

Aug 13, 2009 | Sub-Zero Bottom Freezer Refrigerator

4 Answers

Sub zero refrig - ice forming inside


The solution posted previously is TOTALLY WRONG. A Sub Zero ref doesn't have a heating element in the fresh food section. Only in the Frozen food section. It has 2 totally separate systems for each section. 2 Compressors and 2 evaporators. They share a condenser. If you are having ice build up in the refrigerator then the problem you are having is a refrigerant leak in the fresh food evaporator. You need to have a certified tech come out and replace the evaporator in your refrigerator section of your Sub Zero. Not sure what you are asking about the thermostat.

Oct 12, 2008 | Sub-Zero 661/F Side by Side Refrigerator

1 Answer

Cannot get ice drawer back on the track 500 series


Unfortunately, you need defrost freezer - put freezer thermostat on OFF. You possibly got broken ice tray or damaged sliders.Or leak in ice maker area. Till you defrost that compartment - no chance to pull tray out.





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Jul 23, 2008 | Sub-Zero 632 / S

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