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Old 11-14-2019, 08:59 PM   #1
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Fridge adjustment wacko?

Our fridge in our 12 yr old Montana 5th wheel, will NOT adjust lower.
I slide the plastic gizmo all the way down, to raise temp, but it still goes down to 20-25*, freezing our eggs and milk.
Anyone know what I need to look at?...adjust?...replace?
many thanx
Trapper John
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Old 11-14-2019, 09:11 PM   #2
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Sounds like the thermister has failed. When that happens the fridge goes into full-time cooling(backup mode) regardless of temperatures.
A new thermister will likely solve the issue. How to test a thermister.
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Old 11-14-2019, 10:12 PM   #3
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YES ^^^^^


Your thermistor has failed therfore the thermostat continues to call for cooling (lack of temp sensing)


Replace thermistor.......
If you are sliding it on the FIN then the thermistor wires go thru the back wall of food comaprtment dow to the lower circuit board (Dometic AUTO TEMP CONTROL Model)

Replacement is EASY with an aftermarket rheostat...just snip the wires at thermistor and connect to the rheostat and stick it on the sidewall.
*thermistor wires are embedded into the cooling unit foam


Snip-The-Tip has want you need
https://www.snip-the-tip.com/cgi-bin/articca.cgi




Now IF you have a Norcold Model.......moving thermistor is not how to adjust temps
Thermistors plug into lamp assembly and are plug/play replacement
Just goggle your Norcold Model for thermistor and replace it
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Old 11-15-2019, 01:41 PM   #4
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Moving it down may be the wrong direction. Generally, the fin is coldest along the horizontal centerline and closest to the middle. Moving the thermister away from the coldest part of the fin means it takes longer to get chilled and the cooling unit runs longer and chills more. I realize that traditional wisdom is moving the thermister down "south" makes it warmer, but sometimes it doesn't work out that way, especially if there is stuff loaded in the fridge to affect the temeperature. . I'd play around a bit, maybe move the thermister to another fin (left or right) or try up instead of down. See what happens. It doesn't take a lot of effort to try.


If your thermister isn't working at all, it won't make any difference where you move it.
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Old 11-16-2019, 10:38 PM   #5
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Quote:
Originally Posted by Gary RVRoamer View Post
Moving it down may be the wrong direction. Generally, the fin is coldest along the horizontal centerline and closest to the middle. Moving the thermister away from the coldest part of the fin means it takes longer to get chilled and the cooling unit runs longer and chills more. I realize that traditional wisdom is moving the thermister down "south" makes it warmer, but sometimes it doesn't work out that way, especially if there is stuff loaded in the fridge to affect the temeperature. . I'd play around a bit, maybe move the thermister to another fin (left or right) or try up instead of down. See what happens. It doesn't take a lot of effort to try.


If your thermister isn't working at all, it won't make any difference where you move it.

Thermistor is the FIN Temp Sensor for the fridge thermostat
OEM Position ---fridge thermostat is calibrated to control fridge temps based on the feed back from the thermistor.


Dometic has a few Models with AUTO TEMP CONTROL and IIRC Norcold only has one such Model.
AUTO TEMP CONTROL has no Temp Settings (1-5 or 1-9)
Moving the thermistor UP/DOWN will change the temp range thermostat is calibrated for by 6*F - 8*F


UP.....COOLER Temp
DOWN....WARMER Temp








UP is into a 'warmer' zone of FIN so MORE cooling is called for


Down is into a 'cooler' zone of FIN so LESS cooling is called for
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Old 11-17-2019, 11:10 AM   #6
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Yeah, Biscuit, I know that is what's in the Dometic book. I'm just saying it is worthwhile experimenting a bit. I could show you other tech documents that demonstrate that the further the thermister from the centerline, the warmer the fin and therefore more rather than less cooling. It's not a very precise adjustment and both the particular cooling unit and the stuff loaded in the fridge can alter the fin temperatures.
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Old 11-18-2019, 03:37 AM   #7
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Snip-the-tip is the best!
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Old 11-18-2019, 03:44 AM   #8
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Snip-the-tip did not work for me and I'm not sure why. I bought a "traditional" thermistor and have had no further problems.
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Old 11-18-2019, 10:52 AM   #9
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Originally Posted by Gary RVRoamer View Post
Yeah, Biscuit, I know that is what's in the Dometic book. I'm just saying it is worthwhile experimenting a bit. I could show you other tech documents that demonstrate that the further the thermister from the centerline, the warmer the fin and therefore more rather than less cooling. It's not a very precise adjustment and both the particular cooling unit and the stuff loaded in the fridge can alter the fin temperatures.
Doing The Thermistor Shuffle – RV Refrigeration Repair
That follows the instructions in my Norcold 1200LRIM manual.
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Old 11-18-2019, 07:07 PM   #10
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Agree. It's a good deal at $27.50. The 6 month old Amish Cooling Unit conversion on our 20 year old Dometic would not cool below 40 degrees. JC at the Amish facility said to disconnect the thermister wire at the circuit board and this should default the reefer to full cold. This worked so verified the thermister was bad and I bought a snip-the-tip thermister. This brought the reefer and freezer temps to correct temperature. Also, it has it's own variable temperature control
https://www.snip-the-tip.com/cgi-bin/articca.cgi

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Originally Posted by WPRam View Post
Snip-the-tip is the best!
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Old 11-22-2019, 01:35 PM   #11
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Thanks guys!
I'll try and look into it further this weekend.
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Old 12-01-2019, 05:45 PM   #12
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Where is the circuit board to unplug to test?..over near the main breakers?
thanx
sounds like we're getting somewhere!
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Old 12-01-2019, 06:04 PM   #13
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FRIDGE circuit board.........via outside lower vent panel

You will need to unplug AC and probably DC leads from the board in order to remove the cover

With cover OFF then you can unplug the thermistor leads from the circuit board
Typically P2 connector is the thermistor---usually left top area if circuit board



Course if you post actual fridge model specifc location can be posted
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