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My bosch GSU23420GB/01 freezer will not auto defrost. Technician called out. Checked heater and pc board ok. Said problem was in the wiring between the two parts and could not fix. Seems a shame to scrap it after 6 years. any ideas ?

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  • 42 Answers

SOURCE: Freezer won't defrost

savey73,
I think I know what is wrong. First the defrost thermostat you are talking about I believe is the round metal type with possibly a pink and an orange wire coming out of it. That is not the defrost thermostat as most people know it. That is a defrost overheat termination thermostat that opens only over 140 degrees F, that is why your old good one and your new good one show closed at room temp. If you read on the outside of the metal cover you will find it has a L140 indicating the limit of 140 deg.
Now to what should be causing your problem. You should find on the evaporator coil at the top left side of the evaporator coil a part that has 2 white wires going into what looks like about a 1" long X 1/4" round plastic thing. That little white plastic thing is a THERMISTOR. If it is bad your defrost will not work. Sounds like that is the only thing you have not replaced. There is no polarization of the wires That should FixYa
supertechks

Posted on Nov 24, 2007

  • 110 Answers

SOURCE: LG Refrigerator Defrost Error ER DH

it the def t-stat, def. thermistor, or def. fuse whatever lg decides to call it this week that is causing your issue

Posted on Jun 13, 2008

  • 1073 Answers

SOURCE: Problem auto defrost refrigerator

loaded question any COULD be bad a volt ohm meter will tell you whitch one is bad

if this is a ge sxs i would check the defrost heater first

Posted on Jun 24, 2008

Richie_asg1
  • 1036 Answers

SOURCE: Bosch KGV24V01GB Fridge Freezer -

Hi,

Try increasing the temperature of the freezer (closer to -5) for a few days. It could be you have it too cold.

At certain times it should feel warm in some places on the sides, or you may hear a fan running. If you don't get this, there may be a fault in the defrost circuit, timer or fan.

Make sure vents are clear, and that door seals are in good condition. A faulty door seal admits warm damp air which then freezes.

Where is the ice forming?

Posted on Jun 28, 2008

Richie_asg1
  • 1036 Answers

SOURCE: bosch fridge freezer - ice build up and water leak from freezer

Hi,
This is most likely a blocked drain pipe - blocked with ice that is.

Remove all the drawers in the freezer - and stack them up.
With the unit switched off and unplugged, undo the fixings on the rear pannel in the freezer (behind the drawers)
Remove it to see the evaporator coils etc.
At the base there should be a channel - and a hole leading to the drain pipe. This needs unblocking wih a thin flexible cable. -net curtain support wire is ideal, and cheap. or use a short length of insulated cable.
Check it comes out at the rear of the unit onto the evaporator container - situated on top ofthe compressor.
Replace everything and switch on.

Posted on Sep 08, 2009

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3 Answers

Freezer will not deforst


Contact the service number. They have great customer service. At least they used to have great customer service hotline.

Cheers

Aug 18, 2014 | Viking Refrigerators

1 Answer

Admiral SAL 2027GBB


The first thing you want to do is open the freezer and see if the fan inside there is running. The reason is the freezer cools the refrigerator side by circulating air from the freezer. If the fan is running then your problem is one or more parts of the defrost system is malfunctioned and in return your problem arises. There are three parts to the system, the defrost timer or in some cases control board, defrost thermostat also known as a bi-metal, and the defrost heater. The defrost system is set up to operate as so. The defrost timer or control board will turn the machine off, in some cases every 8 hours, some 12. During this time period the defrost heaters, located behind the freezer wall and rest underneath the evaporator, yet wires to them run up the side of it, are energized and emit heat that raises upward to melt the ice that has formed on the evaporator coils. The bi-metal or defrost thermostat is at the top of the evaporator. When the heat from the heater starts to reach the bi-metal, it breaks the circuit turning the heater off. The whole purpose of this is because the freezer cool the refridgerator side by drawing air across the coils and blowing to the other side via the evap fan motor. In my opinion, if you change one part of the defrost system change them all because usually when one part fails another will follow, so save yourself the time and the food loss, the cost difference is minute.

May 27, 2012 | Admiral 26 cu. ft. Side-By-Side...

1 Answer

Freezer is not defrosting properly , I already change the thermostat, my refigerator model is TBX74UL01 OR TBX74UB01.


If the thermostat is replaced, but still its not defrosting, then two possibilities, either weak defrost heater,Heater is the part which heats and it defrosts, if the heater gets weak, then unit will not defrost properly.And it will take more time to defrost, and till that time, again frost gets collected.---------- But if defrost heater is ok, then problem is defrost board.The defrost board is the part, which controls both thermostat and defrost heater.-----------
This problem is called defrost problem.-------------

So first thing you try is , perform, manual defrost reset procedure.---------

The manual defrost reset procedure is as follows : ----
First unplug the unit from main power outlet. Then empty whole unit completely. Then keep both the doors open. Wait for 24 hours. All the ice collected on the coils and in the freezer section will get melted. Clean the water from the sections. Then Connect the power cord of the unit to main power outlet after 24 hours/.Then set the temperature to normal in both fridge and freezer section. Then check,if same frost is getting collected, then its defrost problem,. If it's again building up ice that means the unit is not defrosting. It's starting the cooling procedure, and then while defrosting, it's not working. The defrost assembly consists of three main parts. The defrost thermostat, the defrost heater and defrost board. Any of the one is not functioning. When thermostat sense the maximum cooling, it triggers the defrost heater to start heating and this defrosts the ice collected on the coils and the system works. Both thermostat and heater are controlled by defrost board. First the thermostat and defrost heater to be checked, if both check ok by meter and visually, then its defrost board causing the problem. IN YOUR case, defrost thermostat is already got replaced, so ignore thermostat, but other two possibilities needs to be checked.----------You can get required parts from from online sites like: --- www.repairclinic.com or from searspartsdirect online site. --------- This should help.Thanks.Helpmech.

Sep 19, 2011 | GE Refrigerators

1 Answer

Ice getting accumulated even it is frost free


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 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 07, 2009 | Bosch Classixx KGV28323 Bottom Freezer...

1 Answer

Variance in freezer compartment temperature


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 and eventually affect the freezer too.

check defrost heater, defrost thermostat. If the heater and thermostat are ok it’ll be the control board.




Sep 04, 2009 | GE GSS20IEM Side by Side Refrigerator

1 Answer

Freezer coils frost up within minutes after being turned back on


Your evaporator coils frost up in normal use and every eight hours or so the entire unit shuts down and the defrost heater comes on to melt the frost. This cycle last about 20 minutes. The melted frost drips into a drain pan and through a drain tube to the drain tray under the freezer/refrigerator where it's evaporated by the condenser fan.

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.

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




Aug 31, 2009 | Bosch Classixx KGV28323 Bottom Freezer...

2 Answers

Bosch fridge leaking water


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Now I think I have other things wrong with mine,after leakage problem the refrigeration compartment wont cool anymore but the freezer part remains working as usual.Ive nailed this down to one of the following not working... Thermostat / timer / defrost heater.So one or more of these needs replacing.Im just trying to look for a manual which shows the nuts and bolts or the refrigerator (not the "How to use" type manual which I have).

Feb 10, 2009 | Bosch KSU49630 Top Freezer Refrigerator

2 Answers

Bosch Classixx Frost Free KGU34640GB/06


You have found where the problem is and now you must find what the problem is. The freezer is not defrosting tells you the problem is there. Defrost of the freezer coil is started by a timer, the time energizes the heaters, when termination temperature is reached the defrost thermostat opens, the timer continues until the time expires (18-22 minutes). First locate the timer, rotate the clutch head screw SLOWLY clockwise until on e click is heard. The heaters should come on a defrost take place. If timer restarts the system after the time period check the heaters for continuity. If no reading on an Ohm meter replace the heaters. If you find the heater O.K. by a continuity reading, check the defrost thermostat.

Jun 18, 2008 | Bosch Classixx KGV28323 Bottom Freezer...

1 Answer

Frost buildup


  It is not defrosting.  You have to remove back wall of freezer where frost is and take hairdryer to melt away frost.  You need to check defrost heater.  This is on bottom of evaporator coils.  It has wires going to it on both sides.  This has to be checked for continuity.  If ok on top of coils is a round unit called a defrost terminator.  This needs to be checked for continuity also.  This must be done before you defrost coils.  It should have continuity when its cold. 
  If these are ok you probably have a bad timer or defrost board. 

Oct 25, 2007 | Kenmore 53542 / 53544 Side by Side...

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