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GE Refrigerator Defrost heaters are shorted to ground.

The defrost heaters run the entire 42 minutes during the defrost cycle causing a temp spike to 78F measured above the ice bucket, creating clumps of melted and then refrozen ice. One blue wire supplies the voltage to the positive side of the heaters. Voltage only appears there during the defrost cycle. Two pink wires come off the ground side of the heaters. One goes to the defrost thermostat. The second one exits through the back panel behind the freezer compartment to places unknown. I cut the pink wire going to the thermostat to verify the short was still constantly present in the second pink wire (it is). Whatever connects on the end of the second pink wire is apparently the cause of the short. Sadly, the wiring diagram was not found anywhere on the unit. Every sample schematic I found on the web shows only one circuit from the heaters to the defrost thermostat. What could the function be of this other circuit? It certainly is overriding the defrost thermostat. In trying to solve this problem, I’ve already replaced the defrost timer (GE part WR9X489 16hr/35min) and the defrost thermostat. There’s one more mysterious part left in the defrost circuit that apparently needs to be replaced and I’m clueless. Help!

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  • Dennisj550 Feb 25, 2008

    I understand what you are saying. Yes, if only the defrost thermostat were connected to the ground side of the heaters, this would be simple. But this is factory wiring ( I bought it new) with two separate pink wires coming off the ground side plug of the heaters. The problem wire that I did not alter exits into the back wall of the freezer. The other pink wire is connected to the pink wire of the new thermostat. In troubleshooting I cut that wire to remove the thermostat from the circuit. The short was still there which would bypass any function of the defrost thermostat anyway! The problem has to be whatever is on the other end of the 'other' pink wire which disappears into the back wall. Admittedly, the evaporator fan does not run during the defrost cycle. Could it be presenting the short I'm seeing to ignore the defrost thermostat?

  • Dennisj550 Mar 04, 2008

    Problem Solved! Both the defrost thermostat and the mullion heater are on the ground side of the defrost heater circuit. The mullion heater had shorted to ground which effectively eliminated any shutoff by the defrost thermostat, giving the defrost heaters reason to run the entire defrost cycle.. Cutting the mullion heaters out of the circuit brought the defrost cycle back to normal. No more clumped ice! Here's a schematic very similiar to my unit:http://www.flickr.com/photos/46797468@N00/2229329439/sizes/o/

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My oven is turning on by itself. It will heat up to around 200 - 250 degress and shut off. I have made sure the knob is in the "OFF" position. Any ideas?

Posted on Dec 22, 2008

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I feel like you have defrost thermostat wired wrong , One side of heater should have nothing hooked to it but one side of thermostat, whitch should shut it off when it goes open.Now some G.E.s have the evaperator fan hooked to the same wire,so it won't run when thermostat is open.If thats the case someone might have wired it wrong causing a back feed.check that out that could be your problem.Someone could have wired a hot lead to it not knowing it was supposed to go dead when limit control opened.hope this helps. God bless. Fxit

Posted on Feb 25, 2008

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GE Profile Bottom Freezer Refrigerator (PFS22SISBSS) not cooling or freezing. Power is on, control panel works. Overnight, the temp went to 51 in refrig and 39 in freezer.


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(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.

May 05, 2011 | GE Profile Stainless Bottom-Freezer...

2 Answers

My GE profile side by side frig goes into defrost mode more often, every 1-2 days. Temps go up to 46 degrees for frig and 8 degrees for freezer. It doesn't take too long before it cools back down. Is...


. 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.

Mar 08, 2011 | GE Refrigerators

1 Answer

HI there, My GE does not make ice in ice compartment, but ice built up entire back wall of refrigerator, I already try to cut off the water line, but the problem the same. Please tell me why? and how do...


DEFROST PROBLEM
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(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.

Feb 28, 2011 | GE (GTS16BCS) Top Freezer Refrigerator

1 Answer

Refrigerator shuts off for extended periods of time. The temp falls, ice melts, etc. then it comes back on, sometimes couple hours later , sometimes the next day.


DEFROST PROBLEM
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(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.


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.

Dec 09, 2010 | GE (PSS26MSRSS) Side by Side Refrigerator

1 Answer

Hi i have a ge profile side by side. the digital temp inside the refrigerator side is reading frezzer 23 refrigerator 47. The frezzer wall is iced up. when i press against the frezzer wall the coil feels...


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(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.

Sep 27, 2010 | GE Profile PSW26P Stainless Steel Side by...

1 Answer

GE PROFILE REFRIGERATOR SIDE BY SIDE IS NOT COOLING DOWN TO THE PROPER TEMPERATURE FREEZER REMAINS AT 20 DEGREES AND REFRIGERATOR AT 47


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.

Nov 17, 2009 | GE Profile PSW26P Stainless Steel Side by...

1 Answer

GE Profile refrigerator freezer is icing on top half


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.

Oct 10, 2009 | GE Profile 26.6 cu. ft. Side-by-Side...

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...

1 Answer

Freezer Defrosts on its own


Yes it is supposed to. 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 it seems to defrost too long and start thawing the contents then the defrost thermsotat may be bad. It's purpose is to stop the defrost heater when the temp reaches around 32 degrees. If it doesn't work the heater will stay on for the entire defrost cycle and possible melt things.
Check here for how to check it and where it is. http://www.acmehowto.com/howto/appliance/refrigerator/refrigerator.php

Aug 25, 2009 | GE GSH25JFR Side by Side Refrigerator

1 Answer

GE Profile SxS Refrigerator wont defrost after new heater installed


If one coil was burnt out and you replaced the heaters and defrost terminator switch I would recheck the continuity through the defrost heaters. You can do this with an Ohm meter with the refrigerator unplugged. If you had an open coil in one of the heaters you did not have to replace the thermo disk. If you have a complete circuit through the heaters try using the old thermo disk. If you have a meter you can check the voltage from the heater connection on one side to the inlet side of the thermo disk with the refrigerator running in the defrost mode. You should read 115-125 Volts on the meter. This reading tells you that the defrost timer is supplying power to the heater circuit.

Apr 30, 2008 | Hotpoint HSS25IFMCC / HSS25IFMWW Side by...

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