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Old 09-13-2012, 10:26 AM   #15
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About the thermistor:

Make sure the fin and the contact surface of the thermistor are clean.

Moving it UP on the fin will make the refer cooler. Down warmer. (It's a counter intuitive design)

Moving it further out from the central fin will make the refer cooler, in addition to up & down. I moved mine one fin to the right and got some improvement, but not enough.

Before you unplug the thermistor be sure to power off the refer.

If you unplug it (connector near the light) the refer will go into Basic Operating System (BOS) mode and cool according to time VS temp. It will get very cold & freeze your stuff so keep and eye on it.

If you take the thermistor completely out and let it come up to room temp (70F) it should have a resistance of somewhere around 9.5K Resistance goes down as temps go up, and it changes a lot with only a few degrees difference. When the refer is at 38F the resistance will be around 24K.

Sometime in the next month or two the makers of 'Snip-The-Tip' will be releasing and adjustable thermistor for the 1200 series. I built a protype from one of their Dometic units and have been able to stabilize my 1200 at 35F, or even colder if I wish.

If there's something else wrong with the refer, bad fans, low airflow, clogged boiler, bad control board etc. nothing you do to the thermistor is going to help.

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Old 09-13-2012, 05:38 PM   #16
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Thanks to all for the help. I googled Norcold 1200 and got to the service manual and how to reset the box as well as thermister specifications.
My thermister does not meet specifications ( new on the way) and my fans do not run. Need to trouble shoot the fans---whether the problem is the fans or control module. Hard to know when to stop spending repair money and just purchase new refrig or cooling unit.

Thanks again for the replies.

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Old 09-14-2012, 04:40 PM   #17
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The fans will be controlled by a heat sensor located at the top of refrigerator attached to the upper fins on the back but you will have to pull the refrigerator out to test it. You should see the wires going up to your fans with your outside cover off. You may have power going up to the sensor but if it is bad it will not let the fans run, it could be bad. The other thing you can do is add a fan in the rear of your refrigerator inside the outside cover, a [110v ac]fan and see if it makes a difference. you will have a outlet there. Resetting the refrigerator is not needed if you have power to the front of the refrigerator [ lit and able to set the temperature to a desired [ setting 1-9 ] Good luck. Hope this helps in your trouble shooting.

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