Adjusting thermistor on an Norcold N3150

Old-Biscuit wrote:
IIRC the thermistor should be on 10th fin from right

That moving of thermistor on Dometics is for those models that have a factory pre-set thermostat ......non-adjustable.

With adjustable temp controls thermistor are 'fixed' position on specific fin to give feed back on fin temp (fin temp 10*f lower than compartment temp)4


What fin is your thermistor on?

It is on fin 11 from right.

Fans running in outside compartment?

Yes, the fan cycles off and on.

Freezer temp is a bit high (5* to 8* ------ S/B 0* to 5*) That shows cooling unit is NOT performing as well as it should.

I was just out checking the temps and the freezer is running 2* and fridge is 35*. This is with the controller turned up to the max setting of 5

Food section fins frosting up.........door seals or warm air coming back up drain hose.
Maybe install a circulating fan in food compartment.

I just bought a fan and it is running in the fridge at this time.

Check for any obstructions that would disrupt draft.
And if Winnebago didn't follow Norcold's installation CLEARANCES & use of baffles then air flow across back is not correct.

It is a side vent unit so pretty hard to see if any thing is blocked but I do feel heat at the top vent and it blows pretty strong when the fan is on.

RV IS Level...correct?

Yes, I'm a stickler on having the RV level. I use a round bubble level and I have a spot in the RV that is level but I always check it in the bottom of the freezer box also.


Installation Manual

I have already downloaded the manuals for it

The frost is because I have been opening it and closing it a lot messing with it right now. This morning the unit went into its cycle and the frost is gone now. The unit has a set up that the temperature control automatically melts the frost on the fins. This is per the manual.

We were also in Memphis when this happened which was very warm and humid. Also as we were driving down there it was about 98 to 99* out and heading east put the side of the coach with the fridge in the direct sun, then the campground sites were situated so the same side was right in the direct sun.

We are heading for the PNW in a couple of weeks so I'll see how it operates then. It should be cooler then also and the fried will be on the north side of the coach most of the way and out of the sun. We well be gone for about a month so I should have a good indication how it operates over a long period of time. When it is sitting in my parking space at home (where we are hot and humid also) it seems to run just great and usually about 3 to 4* in the freezer and 36 in the fridge on setting 3 on the control panel.


I think maybe I'm over reacting. I have a portable Dometic cooler/freezer that we are taking with us and it well be operating in freezer mode so I'm going to take some blue ice packs and freeze them in it over night and if needed I can use them in the fridge. The Dometic has the Danfoss 12VDC compressor in it and boy does that thing work great.

Thanks so much for your help.