I have a confusing issue with a Wine Enthusiast 24 bottle fridge. I have two FX-101 boards, one per zone. It also has a third board, RD091022-04G.
The unit stopped working, i.e. both boards, and the front LED displays were dead.
I checked the capacitors with an ESR meter, they were all bad or out of spec so I replaced them.
Now the unit works again but one of the zones is initially showing an incorrect temp on the front (75F).
As a result it is constantly cooling.
The real temperature is 54F at the NTC in the back. Is it likely the NTC is bad and how do I find a replacement?

MOD NOTE: Please don't hijack another member's thread. You now have your own.

Thread split from: https://forum.allaboutcircuits.com/threads/success-stories-repair-thermoelectric-cooler.101748

 

I have a confusing issue with a Wine Enthusiast 24 bottle fridge. I have two FX-101 boards, one per zone. It also has a third board, RD091022-04G.
The unit stopped working, i.e. both boards, and the front LED displays were dead.
I checked the capacitors with an ESR meter, they were all bad or out of spec so I replaced them.
Now the unit works again but one of the zones is initially showing an incorrect temp on the front (75F).
As a result it is constantly cooling.
The real temperature is 54F at the NTC in the back. Is it likely the NTC is bad and how do I find a replacement?

I measured the two NTCs and they had similar values at similar temps, 15.8 and 16kOhm at 60F.
It turned out I had missed to replace one capacitor ... new and old look same.
The fridge is now working as it should again.

 

I have a confusing issue with a Wine Enthusiast 24 bottle fridge. I have two FX-101 boards, one per zone. It also has a third board, RD091022-04G.
The unit stopped working, i.e. both boards, and the front LED displays were dead.
I checked the capacitors with an ESR meter, they were all bad or out of spec so I replaced them.
Now the unit works again but one of the zones is initially showing an incorrect temp on the front (75F).
As a result it is constantly cooling.
The real temperature is 54F at the NTC in the back. Is it likely the NTC is bad and how do I find a replacement?

Hmmmmm, no it doesn't work. Once something heats up it shows 78F and is starting to permanently cool.
Ideas?
The NTCs both land on the RD091022-04G board.
Ideas?

 

It might help to post some good photos of this “new” board, one that many of the similar repair projects here have not seen.

This is what it looks like:

 

The NTCs might be bad. Try replacing them with new ones.
The RD091022-04G board might be bad. Try replacing it with a new one.
There might be a loose connection between the NTCs and the RD091022-04G board. Try reseating the connections.

 

Are you responding to Juan-OMG on this thread or are you referring to your prior request for assistance?

Well both I guess. A response to "my" thread was moved to this thread.
The NTC connections aren't lose in my case. How do I figure out what the spec is of the NTCs and which one to buy?

 

I confirmed one of the NTCs is in fact bad by swapping them between the two sides. The temp reading then follows the NTCs.
But I can't find any marking on it to determine a product number. Any idea how to determine the specs of the NTC?

The odd things is when I measure them they BOTH show a value of just over 15kOhm ...

 

I confirmed one of the NTCs is in fact bad by swapping them between the two sides. The temp reading then follows the NTCs.
But I can't find any marking on it to determine a product number. Any idea how to determine the specs of the NTC?

The odd things is when I measure them they BOTH show a value of just over 15kOhm ...

Thermistors are categorized by its nominal resistance at 25°C.
See if you can give us three calibration resistances at three temperatures of both the good and bad thermistor.
Resistance readings at 0°C, 10°C (or there about) and 25°C would be perfect.

 

I bought two new 10k NTCs just to be able to test. 10k looked like a common value and seemed correct based on the measurements earlier and it looks like that's the correct value. Not sure the change in temp/degree is the same though.

I couldn't rip out the wiring for the old one in a nice way so I cut the wires inside the fridge and attached one of the new 10k NTCs and measured as best I could.
It looks like the 10k NTCs are pretty close to the old good one. The old bad one increases in resistance way too much as temperatures get lower and seem inconsistent.

I'll keep the new 10k one in there and see how it behaves.

Panel (F)	Temp (F) from accurate sensor	Resistance New 10k (loose in fridge)	Resistance New 10k installed in Fridge	Resistance old bad NTC	Resistance good NTC in Fridge
	70	12017		12000
54	57	16079		18005	17005​
53	58	16084	17140	16028