Author Topic: LG Fridge/Freezer having issues - Cools then warms GN-422FW  (Read 757 times)

Offline haveago

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LG Fridge/Freezer having issues - Cools then warms GN-422FW
« on: December 17, 2013, 06:12:10 PM »
 ???

We have a LG GN-422FW. It starts OK, the temperatures in both compartments drop rapidly and stay down for about 1 hour, then the temperatures start to go upwards, more so in the Fridge than the Freezer. After a few hours the Fridge temperatures are cycling above the safe range for food storage.

It seems that the compressor is OK, however I suspect something else in the circuit is affecting the proper operation of the unit.

The fans all work. The fan in the back seems to work in conjunction with the compressor.

The fan & compressor is off while the temperature rises well above where it should be, again something is not turning the system on when it should be on.

Any suggestions appreciated !
« Last Edit: December 17, 2013, 06:14:38 PM by haveago »

Offline tgoods

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Re: LG Fridge/Freezer having issues - Cools then warms GN-422FW
« Reply #1 on: December 18, 2013, 09:43:23 AM »
When the temperature rises, tap on the relays with a screwdriver handle and see if the compressor kicks on.

Offline haveago

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Re: LG Fridge/Freezer having issues - Cools then warms GN-422FW
« Reply #2 on: December 18, 2013, 10:42:23 PM »
Thanks for the suggestion.

I tried that a few times today & did not have any success. There seems to be several relays, so I tapped all of them several times each.

???


Offline Brent@CanBC

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Re: LG Fridge/Freezer having issues - Cools then warms GN-422FW
« Reply #3 on: December 19, 2013, 02:03:28 AM »
The freezer thermister controls the temp in the freezer side.  Depending on the resistance level, it tells the board to out put voltage to the compressor and fan circuit to bring the temp back to the thermister level.   If the thermister is not doing its thing, the board will not fire up the compressor/fan.   If the fridge side is the problem, there is a thermister in the damper housing, that controls the damper open and closing.  I usually make sure the thermisters are not the issue before changing the boad.

Offline haveago

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Re: LG Fridge/Freezer having issues - Cools then warms GN-422FW
« Reply #4 on: December 19, 2013, 02:26:48 PM »
Thanks again for the tips. I checked out the circuits outside the pcb as best I could. Now the pressure is on by the Missus to get the Fridge off the verandah. So, it looks like scrap.

 

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