Dometic Thermistor | Dometic Thermostat | Dometic Not Cooling | Dometic Repair
Everything one needs to know to fix any Dometic gas/electric RV refrigerator thermisor (fin temperature sensor) in one place.
Dometic fridge not cooling or cooling too well?
This page covers:- The Sensor (where it should be located inside your fridge?)
- Resistance Signals (how to test if the sensor works or not?)
- Fin Temperature and Ice on Sensor
- All Dometic 'RM' or 'DM' Models
- DMR702 Models
- RM1350; RM3762; RM3962 Models
- RM8xxx Models
- RM8xxx Models (European 8 Series)
- NDA1402 Models
We include this video on this page to teach how to:
- Remove thermistor wire from controller
- Show that the fridge will run full time with thermistor disconnected
- Compare fridge temperature to actual temperature in fridge
- Check thermistor location
- Check thermistor plug
- Check wire from control to sensor
- Thermistor changing resistance
Dometic Thermistor Location and Identification
Dometic RM & DM Aamericanna and American Plus Series
Dometic RM1350 | RM3762 | RM3962
Dometic Thermistor DMR702
Dometic European 8 Series
How to Adjust the Temperature when no Control Panel Temperature Selector Switch
Some Dometic RV refrigerators do not have a temperature selector switch on the control panel for the fridge. Please see figure labeled ‘Dometic RM & DM Aamericanna and American Plus Series’ above.
Note on the right side of the fridge there is a sticker that says “cooler*” on top, slide the thermistor seen in the photo up as the arrow indicates so that the fridge runs cooler (warm air rises in the fridge).
If the fridge needs to be warmer (freezing food**), slide the thermistor down the fin toward the bottom of the fridge where the cool air sinks to.
* See section below Fin Temperature and Ice or Frost on Sensor if your fridge is too warm inside.
** See next section and tables if your food is freezing, the thermistor may be open or failed?
What is the easiest way to test a Thermistor?
The circuit in this photo is a Dometic type board that shows the location of the thermistor wire connector labeled P2 (red arrow). Disconnect the thermistor from the control board to force the fridge to run full time for checking the cooling function of the fridge. If the ambient temperature (outside temp) is below 75 degrees Fahrenheit (24C), with the thermistor disconnected the fridge should freeze everything in the refrigerated compartment when run overnight.Dometic Thermistor for RM Models
The following information includes Dometic models:RM2351; RM2354; RM2451; RM2554; RM2551; RM2554; RM2607; RM2611; RM2807; RM2652; RM2653; DM2652: DM2662: DM2663; RM2811; RM3607; RM2862; RM3807; RM3662; RM3663; RM3862; RM3863; RM4872; DM2852; DM2862; RM4873; RM3762; RM3962; RM1350; RM7030; RM7732;
Please note that this board has a thermistor compensation adjustment (yellow arrow). The
following is the Dometic method for checking the thermsitor. Because the failure mode for the thermistor is getting water inside or it,
we prefer to use a remote thermometer and the tables below.
• See our solution to this issue by clicking here.
Dometic Method (not recommended do to destroy thermistor with water)
With the thrmistor disconnected from the circuit board, and in a container with ice and water, the thermistor should read 7,000 to 10,000 ohms. Please note that the typical failure mode for this type of sensor is to cause the refrigerator to cool all of the time due to high resistance. Sometimes there will be a short connector with a ‘thermistor adjuster’; this is just an in-line resistance of 23,200 ohms used on some older models.Fin Temperature and Ice or Frost on Sensor
If there is ice or frost on the sensor, this will insulate the sensor. As a result, the fridge may run colder than it should.• See our solution to this issue by clicking here.
In addition, we recommend a wireless refrigerator thermometer for measuring the temperature inside your refrigerator. Infrared non contact temperature sensors are not very accurate in this situation.
Thermistor Temperature versus Resistance Tables all RM, DM, & DMR Dometic Refrigerators
RM | DM | DMR702 Thermistor Tables
| Temp (degC) | Temp (degF) | Thermistor (ohm) |
|---|---|---|
| -27.78 | -18 | 45627 |
| -27.22 | -17 | 44083 |
| -26.67 | -16 | 42597 |
| -26.11 | -15 | 41166 |
| -25.56 | -14 | 39788 |
| -25 | -13 | 33460 |
| -24.44 | -12 | 37182 |
| -23.89 | -11 | 35950 |
| -23.33 | -10 | 34763 |
| -22.78 | -9 | 33620 |
| -22.22 | -8 | 32517 |
| -21.67 | -7 | 31455 |
| -21.11 | -6 | 30431 |
| -20.56 | -5 | 29444 |
| -20 | -4 | 28491 |
| -19.44 | -3 | 27573 |
| -18.89 | -2 | 26688 |
| -18.33 | -1 | 25834 |
| -17.78 | 0 | 25010 |
| -17.22 | 1 | 24215 |
| -16.67 | 2 | 23447 |
| -16.11 | 3 | 22707 |
| -15.56 | 4 | 21993 |
| -15 | 5 | 21303 |
| -14.44 | 6 | 20637 |
| -13.89 | 7 | 19994 |
| -13.33 | 3 | 19373 |
| -12.78 | 9 | 18774 |
| -12.22 | 10 | 18195 |
| -11.67 | 11 | 17635 |
| -11.11 | 12 | 17095 |
| -10.56 | 13 | 16573 |
| -10 | 14 | 16068 |
| -9.44 | 15 | 15581 |
| -3.39 | 16 | 15109 |
| -3.33 | 17 | 14654 |
| -7.78 | 18 | 14214 |
| -7.22 | 19 | 13788 |
| -6.67 | 20 | 13376 |
| -6.11 | 21 | 12978 |
| -5.56 | 22 | 12593 |
| -5 | 23 | 12221 |
| -4.44 | 24 | 11861 |
| -3.89 | 25 | 11513 |
| -3.33 | 26 | 11175 |
| -2.78 | 27 | 10849 |
| -2.22 | 23 | 10534 |
| -1.67 | 29 | 10223 |
| -1.11 | 30 | 9932 |
| -0.56 | 31 | 9646 |
| 0 | 32 | 9370 |
| 0.56 | 33 | 9101 |
| 1.11 | 34 | 8842 |
| 1.67 | 35 | 8590 |
| 2.22 | 36 | 8347 |
| 2.78 | 37 | 3111 |
| 3.33 | 33 | 7883 |
| 3.89 | 39 | 7662 |
| 4.44 | 40 | 7448 |
| 5 | 41 | 7240 |
| 5.56 | 42 | 7039 |
| 6.11 | 43 | 6845 |
| 6.67 | 44 | 6656 |
| 7.22 | 45 | 6473 |
| 7.73 | 46 | 6296 |
| 3.33 | 47 | 6124 |
| 3.09 | 48 | 5958 |
| 9.44 | 49 | 5796 |
| 10.3 | 50 | 5640 |
| 10.56 | 51 | 5483 |
| 11.11 | 52 | 5341 |
| 11.67 | 53 | 5198 |
| 12.22 | 54 | 5060 |
| 12.73 | 55 | 4925 |
| 13.33 | 56 | 4795 |
| 13.89 | 57 | 4669 |
| 14.44 | 53 | 4546 |
| 15 | 59 | 4427 |
| 15.56 | 60 | 4311 |
| 16.11 | 61 | 4199 |
| 16.67 | 62 | 4090 |
| 17.22 | 63 | 3934 |
| 17.78 | 64 | 3882 |
| 13.33 | 65 | 3782 |
| 18.39 | 66 | 3685 |
| 19.44 | 67 | 3591 |
| 20 | 68 | 3500 |
| 20.56 | 69 | 3411 |
| 21.11 | 70 | 3325 |
| 21.67 | 71 | 3241 |
| 22.22 | 72 | 3160 |
| 22.78 | 73 | 3081 |
| 23.33 | 74 | 3004 |
| 23.89 | 75 | 2929 |
| 24.44 | 76 | 2857 |
| 25 | 77 | 2786 |
| 25.56 | 78 | 2717 |
| 26.11 | 79 | 2651 |
| 26.67 | 80 | 2586 |
| 27.22 | 81 | 2523 |
| 27.78 | 82 | 2461 |
| 28.33 | 83 | 2402 |
| 28.89 | 84 | 2344 |
| 29.44 | 85 | 2237 |
| 30 | 86 | 2232 |
| 30.56 | 87 | 2179 |
| 31.11 | 38 | 2127 |
| 31.67 | 39 | 2076 |
| 32.22 | 90 | 2027 |
| 32.78 | 91 | 1979 |
| 33.33 | 92 | 1933 |
| 33.89 | 93 | 1887 |
| 34.44 | 94 | 1843 |
| 35 | 95 | 1800 |
| 35.56 | 96 | 1758 |
| 36.11 | 97 | 1717 |
| 36.67 | 98 | 1678 |
| 37.22 | 99 | 1639 |
| 37.78 | 100 | 1601 |
| 38.33 | 101 | 1565 |
| 38.89 | 102 | 1529 |
| 39.44 | 103 | 1494 |
| 40 | 104 | 1460 |
Thermistor Values for RM8xxx Models
| degF | degC | kOhm |
|---|---|---|
| 32 | 0 | 27.7 |
| 41 | 5 | 22.29 |
| 50 | 10 | 18.07 |
| 59 | 15 | 14.74 |
| 68 | 20 | 12.11 |
| 77 | 25 | 10 |
Thermistor Values for Dometic NDA1402
| degF | degC | Ohm |
|---|---|---|
| 70 | 21 | 2343 |
| 65 | 18 | 2601 |
| 60 | 16 | 2917 |
| 55 | 13 | 3275 |
| 50 | 10 | 3684 |
| 45 | 7 | 4152 |
| 40 | 4 | 4687 |
| 35 | 2 | 5300 |
| 30 | -1 | 5952 |
| 25 | -4 | 6755 |
| 20 | -7 | 7682 |
| 15 | -9 | 8754 |
| 10 | -12 | 9995 |
| 5 | -15 | 11435 |
| 0 | -18 | 13111 |
| -5 | -21 | 15064 |