Author Topic: defrost control gx5shtxtb00  (Read 2253 times)

Offline JPG

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defrost control gx5shtxtb00
« on: April 14, 2011, 05:37:37 PM »
I have a bottom mount whirlpool which I believe is actually a ge... the unit was completly frosted up so I slowly unthawed replaced the bimetal the element seems good. so to be safe I will replace both thermisiers and the main control board in fridge section, right? that is where I assume the defrost mech is on??  Is there anything else I should replace?

I had another customer with the same fridge while the fridge was off and I was defrosting the evap the compressor stayed on while everything else was off?? that was wierd? Have any of u seen that? I assume that is a baD CONTROL TOO?

tHAN I had another one just like this model replaced all mentioned above and it still frosted up later?????? I gave up on that one...

Model gx5shtxtb00

Offline JWWebster

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Re: gx5shtxtb00
« Reply #1 on: April 14, 2011, 09:03:03 PM »
In these new fangled ice boxs is what you call adaptive defrost controls. Instead of the old tried and true defrost timer, brainiacs have decided to use artificial intelligence to determine defrost. The basic pattern of adaptive defrost is: COOLING,PRE-CHILL,DEFROST,DWELL,and POST-DWELL. Hey I ain't making this up. The ADC (adaptive defrost control) Counts the number of times the doors are opened, the total compressor run time, and the length of time the defrost heaters were on during the last defrost, with the initial defrost happening at 4 hours after plugging that bad baby in fer the first time. This method supposedly enables the adc to work nice in all kinds of conditions, whether hot and humid or cold and frigid climates. COOLING Mode will remain for an indefinite time or until defrost is determined by the micro-processor. When all systems are go for defrost the adc makes the jump to light speed by going into PRE-CHILL, this brings down the temps in the freezer to off set the defrost operation so that the food temp does not suffer dramatic temp rises. Pretty cool ain't it? If the ice box is in pre chill and the door gets opened then a DEFROST HOLD OFF will jump in and not do a defrost for several hours. If the door is continually opened at the end of 16 hours the adc is gonna defrost that ice box anyway. The defrost varries but is a maximum time of 45 minutes including DWELL. Dwell is the length of time the ice box stays off AFTER the heater is terminated.
Then The POST DWELL will kick in. The post dwell will fire up the compressor and condenser fan but the inside fans will not run allowing the coils inside to cool down before them fans kick in and she jumps back into Cooling mode. I bet you would like to have a copy of GE's adc repair manual wouldn't you?

How it werks
« Last Edit: April 14, 2011, 09:05:32 PM by JWWebster »
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Offline JPG

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Re: gx5shtxtb00
« Reply #2 on: April 15, 2011, 11:54:42 AM »
wow  that still doesnt suprise me ,yea those brainiacs are deffintly makeing it worse to repair...so the 2 thermisters bimetal and the one control is basically the whole defrost circuit right?

Offline JWWebster

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Re: gx5shtxtb00
« Reply #3 on: April 15, 2011, 01:23:15 PM »
Could be more than 3 look and see how many inputs is on the board. Have you seen this nice video from Shawn Ryan? How to check thermistors?


May the hinges of our friendship
        never grow rusty.

About the icons: The beer is tip link, if a tech saves ya some money buy em a 6 pack. The small green square=personal message. The green dot is a link to my web page on appliance repair and other general BS I love to post. The letter sends me email.
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