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Defrost thermostat open/closed

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I ordered and received a defrost thermostat and wanted to test it before putting it in. The circuit is open

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Old 03-11-2018, 06:25 PM
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Default Defrost thermostat open/closed
Model Number: TBX18HA, part 37TV31   Brand: GE   Age: 1 - 5 years   

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I ordered and received a defrost thermostat and wanted to test it before putting it in. The circuit is open (infinite res) out of the box at room temp. I froze it with spray just to see if it was backwards, and it stayed open. I put it under a heat lamp and at 84F it stayed open.

Then I returned it because I thought it was bad. I received a new one and it tests the same way. I was assuming that the thermostat should be open until it gets too cold, then should be closed, to turn the heater on. Am I mistaken?


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Last edited by Jorabi : 03-11-2018 at 06:28 PM.
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  #2 (permalink)  
Old 03-12-2018, 05:14 PM
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It depends on the temp. range the defrost thermostat/cutoff is made for.

Most complete the circuit or close at a temp. around 10 degrees F or lower.

The best way to test one is put it in a deep freezer for 5 hours or so then check it for continuity. It would take a lot of freeze spay to chill one down.
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Old 03-12-2018, 06:59 PM
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I apologize for writing my original question backwards. It should have said:

I ordered and received a defrost thermostat and wanted to test it before putting it in. The circuit is closed (zero res) out of the box at room temp. I thoroughly froze it with spray until it was entirely covered with frost, and it stayed closed. I put it under a heat lamp and at 84F it stayed closed.

I returned it because I thought it was bad. I received a new one and it tests the same way. I was assuming that the thermostat should be open until it gets too cold, then should be closed, to turn the heater on. But these are always closed. How can I test if the open/close is working?
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Old 03-13-2018, 12:00 AM
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Your model number is incomplete , but all the ones similar to yours took part WR50X10006 .

It looks like it has L53-40F on the side. L is limit 53 degrees F is when it opens and shuts down the defrost element.

-40 is the temperature it closes at. That is 53 - 40 = 13 degrees Fahrenheit.

So it has to get to 13 degrees to complete the circuit for defrost .

This part.
GE WR50X10006 Thermostat Def - AppliancePartsPros.com
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Old 03-13-2018, 07:51 AM
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Snap, I bought the wrong part. I was going by the 37TV31 stamped on it but I guess more than one thermostat uses that. The one I got was WR50X10068 instead of 10006. It says L140-30F and it does open if I heat it to 140 and closes when it cools down.

Thanks, I will have to exchange it for the correct part.
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