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I have a GE that freezes up on the bottom coils. I have checked both defrost elements, the defrost bi-metal,

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Old 06-22-2011, 07:26 AM
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Default Refrigerator freezing up
Model Number: tfh22prsm bb   Brand: GE   Age: More than 10 years   

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I have a GE that freezes up on the bottom coils. I have checked both defrost elements, the defrost bi-metal, and the defrost timer, and they tested good. When I turn the defrost timer to make it defrost (it clicks), the defrost heaters do not come on. The temp never gets cold enough, and freezes up soon after defrosting. How cold does it have to be to make the defoster work. Any help out there?
Barry


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  #2 (permalink)  
Old 06-22-2011, 12:15 PM
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Quote:
Originally Posted by tclabare View Post
I have a GE that freezes up on the bottom coils. I have checked both defrost elements, the defrost bi-metal, and the defrost timer, and they tested good. When I turn the defrost timer to make it defrost (it clicks), the defrost heaters do not come on. The temp never gets cold enough, and freezes up soon after defrosting. How cold does it have to be to make the defoster work. Any help out there?
Barry
Barry,

The defrost thermostat is rated at 60 dgrs., so as long as the evaporator arae is less than that, the heater should come on and defrost the evaporator coil.

Here's a basic defrost cycle operation :

The timer advances based on compressor run time, after 8 hours total run time, the timer advances into the defrost cycle.
When the defrost contacts close(in the timer) it sends 120 VAC from the timer to the defrost thermostat.
The thermostat (as long as it is a closed circuit) feeds the 120 VAC to the heater, the voltage passing through the heater causes the heater to get hot, and melt the ice on the coil.

With everything circuit checking proper, you'd need to conduct a voltage check, on each contact or terminal until you find the low voltage or no voltage to chassis ground, and repair or replace the previous component or wire.

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Old 06-22-2011, 12:41 PM
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Default Refrigerator freezing up

Joe, thanks for the quick response. What powers the defrost timer, maybe it's not getting power, how do I test for power to it, and how much voltage should there be? The ice maker quit working about the same time I started having problems. Both fans work, defrost element, defrost thermostat, and the defrost timer, checks ok with an Ohm meter. I swapped a timer just for the hell of it, same problem, the heaters never came on. Temp in the freezer is 39, temp in the fridg is 58F. Does the thermostat in the fridg have anything to do with this? I cleaned the condenser, with a vacuum about 3 months ago, its still somewhat clean. Since it is working, I hope that there is some hope for a repair, if not maybe it's time to replace it.
Barry


Quote:
Originally Posted by Joe / APP Team View Post
Barry,

The defrost thermostat is rated at 60 dgrs., so as long as the evaporator arae is less than that, the heater should come on and defrost the evaporator coil.

Here's a basic defrost cycle operation :

The timer advances based on compressor run time, after 8 hours total run time, the timer advances into the defrost cycle.
When the defrost contacts close(in the timer) it sends 120 VAC from the timer to the defrost thermostat.
The thermostat (as long as it is a closed circuit) feeds the 120 VAC to the heater, the voltage passing through the heater causes the heater to get hot, and melt the ice on the coil.

With everything circuit checking proper, you'd need to conduct a voltage check, on each contact or terminal until you find the low voltage or no voltage to chassis ground, and repair or replace the previous component or wire.

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  #4 (permalink)  
Old 06-22-2011, 12:44 PM
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Default Refrigerator freezing up

Joe, I just saw the voltage needed to run the heater, 120v.
Thanks again, Barry
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Old 06-22-2011, 03:26 PM
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Quote:
Originally Posted by tclabare View Post
Joe, I just saw the voltage needed to run the heater, 120v.
Thanks again, Barry
OK,

So is it a problem with the heater or a loose connection ?

Let us know how we can help, if you need more.

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