Question about Bosch B22CS50SNS Side by Side Refrigerator

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I need to replace the Defrost Heater on a Bosch B22CS50SNS. How do I remove the rear refrigerator cover panel (lower panel) and the Air Channel, so I can get to the evaporator assembly?

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Jorgie Navito

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Posted on Mar 29, 2020

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  • 161 Answers

SOURCE: defrost thermostat connector

Where is the defrost heater? If it is below the problem area, I don't think it is a defrost problem. This sounds like low freon. The symptoms of this are heavy frost on only part of the coils. Try deforsting with a hair dryer and putting it back together. Wait about 3 hours and look again. If there is frost only on part of the coils that is bad. The most this unit could defrost is every 4 hours, most are on 8 or 12 hour cycles. On most units the defrost timer shuts off the compressor and gives current to the defrost heater/s through the defrost thermostat. This thermostat is closed below 15 degrees and opens at a much higher temp after sensing the heat. This shuts off the heat usually before the timer and lets the water drip down where it should go. Then the timer turns the compressor back on and removes current from the defrost system. A common defrost problem is if the doors are left open for a LONG time or not shut all the way. Sometimes it causes so much ice that it can't melt with just one defrost cycle. This problem builds as if air flow is restricted it causes even more frost and gets worse. If this ever happens , just find the defrost timer and turn it very slowly click by click just until the compressor stops. Let it defrost , then do it again in about 2 hours. If it is a low freon problem there may still be a partial warrenty left sometimes the sealed system is guarenteed ror 5 - 10 years. Sometimes if it is not covered it is not worth fixing.

Posted on Jul 04, 2008



  • 3361 Answers

SOURCE: how to remove front panel and front shroudand lift the top cover?

Open the door.
Remove 4 screws in side door frame.
Lift door up on hinge side and remove the door.
Front panel will snap out and off.
Remove screws in the front top right and left corners to remove the top.

Posted on Mar 13, 2009


Randy Hough

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SOURCE: icey coils,replaced bunrt defrost heater coils still ice up

Replace defrost timer and defrost thermostat.

Posted on May 13, 2009

Sea Breeze

John Tripp

  • 4656 Answers

SOURCE: evaporator coil freezing, replaced main control

It is possible you have a defective fan motor in the condenser area or evaporator area. Sometimes when they become defective they will run for a while and just warm up and stop while the compressor continues to run. I learned that one on four costly returns to the home. The cost was to me not the customer. Thanks, Sea Breeze

Posted on Aug 05, 2009


  • 1 Answer

SOURCE: Replacing Defrost Heater and Bracket in Freezer Section of Fridge

I ended up having to remove things in this order: all shelves, ice maker insert, ice maker top ice tray, ice maker lower motor housing, shelving support rails (2), rear evaporator coil cover. This exposed the evaporator coils (which were already dry since the fridge had been off for two days) and most importantly, the defrost heater element below the coils. The heater element was easily unplugged from it's two connectors. I tested the unit with an ohm meter and it indicated it was open (infinity resistance). I then knew it was bad. I replaced it with a new unit and put everything back together in reverse order taking care to use the same screws. The fridge appears to be back in working order.

Posted on Oct 19, 2009

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I have a kitchen aid two sided refrigerator model #KSRB27FHSS04.The freezer part always iecing up, change the thermostat about 3 weeks ago. The fridge part still is not cooling like it should.

Yes I see the panel is covered in frost indicating a failed defrost heater and defrost thermostat. If you changed the timer then you have two more components that need to be replaced=> The 2188175 Defrost Heater Assembly and the=> 2196155 or W10225581 Defrost Thermostat Here is a KSRB27FHSS04 pats manual for your model and the parts are located behind the panel in your photo. Parts are listed on page 17 of the parts manual. You will need to defrost freezer before you will be able to see or replace these parts. Unplug and remove that rear panel and use a hair dryer to melt the ice blocking airflow on the evaporator. Please send another photo of the ice once you get rear cover off in back of the freezer
Appliance 911 Sea Breeze

Oct 05, 2015 | Refrigerators

1 Answer

First the refrigerator portion lost cooling but the freezer was fine over time the freezer esentially turned into a refrigerator. It is no longer making ice or keeping things frozen, but is about as cool...

the evaporator coil is frozen over and cant release cold air due to this,defrost the unit remove rear panel inside freezer and troubleshoot the defrost heater and thermostat and also make sure the fan near this coil is running, on the evaporator coil as,you cant blow cold air thru a coil covered by ice

Jul 02, 2011 | Jenn-Air JSD2789GES Side by Side...

2 Answers

Refrigerator does not freeze enough

Lets have a look at rear wall of freezer, is there frost building up? Usually in top freezers the cold air settles to bottom and you don't notice fresh food section until about a day. If frost is building open fresh food sections door and in control panel=> CLICK HERE see item 257 in photo? That is WR9X565 or 311082 Defrost Timer Just below that is the control panel cover and you should have a small plastic plug covering a hole just below the defrost timer. Pry plastic plug out and using a flathead screwdriver turn the defrost timer clockwise slowly. Once you hear the compressor and fans stop stop turning timer and about a minute later you should hear some crackling noise coming from freezer. Allow to stay like that for up to 30 minutes and timer should come out of defrost and compressor and fans should start again on their own. If this action caused defrost then replace the defrost timer. If that does not seem to cause defrost the we need to go to step two, unplug and place items in a cooler or alternate refrigerator and use a hair dryer to assist in melting the ice behind rear panel. Remove rear panel in back of freezer and see => Freezer Components item's 621 and WR51X10038 or 880036 Defrost Heater Assembly
You will need to remove rear panel and work with refrigerator unplugged from power. On this=> Page watch how to test your defrost element just beside a photo of the timer. Most times I replace the defrost thermostat while inside freezer wall but I will let you try this first and please respond and rate, Thanks, Sea Breeze


WR51X10038 or 880036 Defrost Heater Assembly

Feb 13, 2011 | GE GTS22KBP Top Freezer Refrigerator

1 Answer

Freezer does not go lower than 30 degrees

First eliminate a defrost problem. Look into the back of freezer and see if you see a layer of snow or frost building up. If ye, unplug remove the contents and the rear panel of freezer and continue to defrost with a hair dryer. Your refrigerator has a Adaptive Defrost control that is hiding inside the fresh food compartments control panel. It is the most likely reason for the lack of defrost. If not a defrost problem then your fan below refrigerator is not blowing the warm air of of condenser or the condenser is covered in dust . The part number for the ADC is Click Here=> 4388932 the next would be the defrost heater and defrost thermostat. Defrost heater part number=> 2188175 or Part Number 452192 Defrost Heater where there is no photo. And defrost thermostat part number=> 2898445 and no one has a picture of it but I will send you a parts manual for your model=> ES5FHAXSQ00 picture can be found on page 15 Here is a user manual=> ES5FHAXSQOO
If need you may contact me here on Vr2020 or my Forum=> Appliance 911 My contact information is located above the Vr2020 Ad on my blog here=> Sea Breeze Appliance Parts and Technical Services, Thanks, Sea Breeze


Feb 11, 2010 | Whirlpool ES5FHAXS Side by Side...

1 Answer

The freezer is 19deg and the lower food compartment only gets to 60deg

Model number is always valuable in order to be able to give you more accurate information.

Check rear wall of freezer by feel for frost. Heavy, even frost indicates likely problem in the defrost system. Defrost heater (most likely and in freezer behind rear wall), defrost thermostat (in freezer-must be checked at freezer temperature) or one of Defrost timer or Defrost control (Circuit board) generally located in Refrigerator compartment but may be inside rear of outer case. Defrost heater and defrost thermosts can be checked with an ohmmeter. Disconnect power to refrigerator, remove rear wall and disconnect at least one side of any component you are testing. If the heater and defrost thermostat test good for continuity then replace the defrost control.

Without repair refrigerator will work perfectly for about 7-10 days after being COMPLETELY defrosted, including behind freezer panel, until thick frost builds up again cutting off air flow to both compartments

Oct 03, 2009 | Whirlpool Refrigerators

1 Answer

The back wall of my fridge is freezing up... I had a repair man replace two sensors and to no avail then I replaced the mother board and that did not work either... what now?

Unplug the refrigerator . Remove the motherboard cover . Remove the blue plug with large wires from the motherboard . Looking at the plug , you'll see wire1,wire2,space,wire3 . Using a short piece of wire with both ends striped , insert the ends into wire2 and wire3 . Plug refrig back in . Look in the freezer at the bottom of the rear wall , for a red glow . May take several min . If no red glow , replace the defrost heater AND the defrost thermostat (bimetal ) . If red glow , bad control board .
The defrost heater and bimetal , are behind the rear lower panel inside the freezer section . The heater is at the bottom of the coils , and the bimetal is clipped on at the top of the coils ( blue and pink wire ) .

Sep 06, 2009 | Refrigerators

1 Answer

Refrigerator not cooling

unplug appliance, melt ice on back of freezer, remove panel rear of freezer, find leads to defrost heater and test with a multimeter, if you have condinuity replace defrost termostat, if no condinuity replace defrost heater. after removing panel you will have to melt ice in rear with heat gun before testing.

Jun 22, 2009 | Admiral Refrigerators

2 Answers

Freezer Side is fine bit refrigerator side isn't cooling. Vents have been cleaned.

Pretty common problem among refrigerators. Look to see if you have frost on the rear wall of the freezer just above the lower basket. If you see frost on the rear panel, it most likely has about 3 to 4 inches full of frost on the coils behind that panel. If it does, you will have to remove the lower rear panel, and defrost the coils until they are clean, just like it was at the factory new. Once those are cleaned of frost, you should replace the defrost heater at the bottom of those coils. Some GE's have a kit that has a heater and a defrost thermostat all in one, and some do not. Some only come with just a heater replacement. If it comes only with the heater, you must also order a defrost thermostat, which is positioned above the coils, also. They both MUST be changed.

The other thing is to make sure that the fan inside of your freezer is working properly. The fan motor, and the defrost heater assembly are very common problems. Your refrigerator will work fine if you find out frost was the problem here, because the fresh food side gets its cold from the freezer side. If it is plugged with frost, the fan can't push air through the coils to the fresh food side. Hope this helps.

May 21, 2009 | GE GSH25JFR Side by Side Refrigerator

1 Answer

GE SIde By Side - No cold air on the freezer side.

Do you hear fan running in freezer? Should be on when you hear that external fan. If not, you may need an evaporator fan motor. Also check board in back for burned resistor. May need to replace both.
If that fan IS running, remove lower rear wall of freezer and inspect the defrost heater. It's at bottom of coils. It has a wire leading to both sides. Remove with 2 screws and check for continuity. If open replace defrost heater. This is a common failure on these.

Nov 18, 2007 | GE (PSS26MSRSS) Side by Side Refrigerator

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