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Refrig Freezer Defrost Fails - Ice Build-UP

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Hi, My GE refrigerator defrost fails to function causing the cooling coils to develop ice. This happened before when the

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Old 04-28-2013, 01:29 PM
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Default Refrig Freezer Defrost Fails - Ice Build-UP
Model Number: TBX18AKE   Brand: GE   Age: More than 10 years   

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Hi, My GE refrigerator defrost fails to function causing the cooling coils to develop ice. This happened before when the unit was about seven years old. I replaced the Defrost Thermostat and it resolved the issue. I suspect the same issue this time.

While I'm waiting for the new Defrost Thermostat to arrive, I removed the suspected failed defrost thermostat to see if I could get the unit to defrost. I tried both conditions: 1. left the circuit open (thermostat removed) and 2. closed the circuit (shorted the connecting leads) to see if I could validate the thermostat issue. The unit appears to develop frost in either condition which causes me to suspect that there might be another issue causing the unit to fail to defrost.

Also, the ice maker stopped making ice. I suspect the two issues are related.

Does anyone have any suggestions?

Regards


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Last edited by tjg79 : 04-28-2013 at 01:45 PM.
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  #2 (permalink)  
Old 04-29-2013, 02:42 PM
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Hi,

Prior to order any replacement parts you have to test them to save time and money. There are only two defrost parts (defrost thermostat and defrost heater) in the freezer and it is pretty simple to test them for continuity using a simple multimeter like the following:

- the multimeter Part number: AP5641751

Part number: AP5641751


or any other of your choice.

The following article on our forum will explain in detail how to run a continuity test using either an analog meter or a digital meter - How To Check Continuity With Ohmmeter

- The defrost heater Part number: AP2071483

Part number: AP2071483



- The defrost thermostat Part number: AP2071242

Part number: AP2071242



If both of the above parts are good, replace the defrost timer.

- The defrost timer Part number: AP2061708

Part number: AP2061708


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Last edited by Gene : 04-29-2013 at 02:45 PM.
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Old 04-29-2013, 02:51 PM
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Thank you Gene,

I know the heater works. I removed the defrost thermostat and shorted the leads. The heater was working. I checked the defrost thermostat with a multimeter and it was open (no continuity) after it was removed. I placed it on ice and it checked out as having continuity at about 6 ohms resistance. It appears to me that the thermostat may be good as well as the heater.

Because one lead from the defrost thermostat connects to the plug for the ice maker and the fact that the ice maker is not making ice, I suspect the problem may be an ice maker electrical problem.

Do you have any diagnostic recommendations to check to further isolate this issue?

Regards
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Old 04-29-2013, 03:18 PM
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Lets do one thing at a time. The thermostat is probably bad because 6 Ohms reading is incorrect.

Replace the thermostat and we will go from there.

Gene.
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Old 04-29-2013, 03:21 PM
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Thanks Gene,

The new thermo should arrive in a day or two. I'll posts the results as soon as I have it installed.

Regards

Last edited by tjg79 : 04-29-2013 at 03:28 PM.
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Old 04-30-2013, 11:18 AM
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Installed new Defrost Thermostat.

I will observe to see if everything is resolved.

How long will I have to wait to see if this fix resolves the ice maker issue?

Regards
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Old 05-01-2013, 05:09 AM
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It will be awhile before I notice any frost build up inside the freezer compartment with the covers installed.

Since one lead from the defrost thermostat goes to the connector for the ice maker, could a fault in the ice maker electrical harness cause the frost build-up?

The ice maker is still not functioning. I filled the tray with water and it did rotate out one iteration of ice after about 18 hours. It doesn't seem to be getting any water. I notices that is did cycle once in the last 24 hours, but only produced ice about 15% of the normal size.

Does the defrost timer affect the ice maker? Will the refrigerator defrost properly with the ice maker unplugged from the connector to the electrical harness?

Status so far:

Defrost Heater - I know it heats.

Defrost Thermostat - Replaced, original may have been good.

Defrost Timer - suspect, new one on order

Ice Maker - suspect

Water inlet valve - suspect
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Old 05-02-2013, 05:59 AM
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My current observation is that the ice maker completes one cycle in about 24 hours producing ice cubes of about 50% normal size.

I'm pending arrival of the new Defrost Timer.
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