Fridge Thermistor Replacement Question UPDATE (Fixed)

Yes it didn't work when I swapped to the old Dometic thermistor. I have not yet checked either one for R. Based on above posts, first I need to confirm the Norcold one is not right before getting a new one or one of those other gizmos.

Camping this weekend I just turned off the fridge when the fridge thermometer said it was getting too cold, and back on again later.

I am really mixed up on how the thermistor works. AFAIK they have more R when cold (at least those in-rush ones do), so that would mean the signal to turn off the fridge is when R gets that high.

But then, they say to move the thermistor up where it is warmer on the fins to make it shut off sooner. Makes no sense to me. Oh well.

http://rvrefrigeratorrepair.com/uncategorized/the-thermistor-shuffle/

The couple of resistance charts I found showed the Norcold thermistor resistances don’t match the Dometic. So I’d say no, it won’t work to borrow an old Dometic one.

Our Norcold 611V would freeze everything. A new thermistor didn't help and neither did adjusting it. The solution was to install an adjustable "optical controller board", I got the board under warranty & it was a 5-minute job to change it.

Download the service manual.

Thanks. Also noted the way to measure its R. Heading out so no replies for a few days.

I would get the correct part for your Dometic. Here is one listing from Amazon for Dometic.

Dometic thermistor
Is your circuit board an original Dometic?

thermister is probably bad. google "Snip-the-the tip". Should fix your problem.