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Old 09-14-2015, 08:17 AM   #1
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Refrigerator thermostat readout - wrong wrong wrong

We had our refrigerator temperatures all over the place, like many others. And yet, when it would say 52 degrees, things would be frozen. So we bought an internal temp gauge, and low and behold, the readout is never accurate. To the tune of 5~10 degrees wrong.

When it says 42 it's actually 36 in the refrigerator. Anyone else have this problem? Do I need to relocate the sender in the refrigerator? Anyone replace their sender and temperature gauge?
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Old 09-14-2015, 08:33 AM   #2
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I have often wondered about that myself. We've never had it go much higher than 45 degrees. What brand internal thermometer are you using?
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Old 09-14-2015, 09:11 AM   #3
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I keep separate manual refrigerator thermometers in main compartment and the freezer. I too have noticed fluctuations of the refrigerator digital read out can range 3-10F higher than my manual thermostat in main compartment. So I use the refrigerator digital read out as a directional state of the frig. and depend on the portable thermostats as actual state of the internal temperature. This is in a 2016 25' FC.
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Old 09-14-2015, 11:50 AM   #4
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I set the fridge on #4 setting. Temp. always reads 35 to 37 degrees. Am I asking for trouble by putting a thermometer in the fridge?

Bruce
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Old 09-14-2015, 12:03 PM   #5
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The most accurate way to measure fridge temp is to put a glass or mug of water in the fridge and stick a traditional chemistry thermometer in the water.

We've been doing this for a couple of months and finding that our fridge fluctuates between 37* and 44*, depending on the ambient temps. When the ambient temps are around 100*, the fridge goes up to 44*. In ambient temps of up to mid-80's or so, the fridge is able to maintain around 38*-40*.

We are using this thermometer
http://www.amazon.com/Instrument-Org...mersion+Pocket

We need to put the fridge control setting at its highest level, except when camping in temps of 70 and below.

We're going to try a fan in the back/flue to see if that can help keep the temps down when in high ambient temps, although we rarely use the coach in places/times where ambient temps are much over 90*.

Twin AC units are something we are so thankful we specified when ordering our AS. Even though we don't camp in high temps, Airstreams are not as good as SOB RVs when it comes to insulation against high temps. Even in temps in the high 80's we find both AC units a Godsend. Keeping the interior of the coach cooler probably helps the fridge cope with higher temps, although the outside temps are a major factor....along with keeping the sun from shining directly on the fridge side of the coach.
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Old 09-14-2015, 12:50 PM   #6
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My 2008 Dometic 7 cu/ft temperature seems accurate. I used to have a wireless thermometer sensor velcroed to the side and its readings were consistent to the outside fridge display. I've also used one of those thermostat pointy probes and the temperature seems consistent. I've never been able to achieve anything colder than 31F. When the fridge interior gets down to 32F the system seems to shut off the cooling. I'm envious of people who claim their fridge freezes food.

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Old 09-14-2015, 02:17 PM   #7
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Quote:
Originally Posted by AstroBruce View Post
I set the fridge on #4 setting. Temp. always reads 35 to 37 degrees. Am I asking for trouble by putting a thermometer in the fridge?

Bruce

Interesting you mention this. Where I mentioned above I can have variances of 3-10F between the frig digital readout and manual chemistry style thermometers I use: the variances between the two seem to always be minimum when the frig digital readout is is showing 35-39. It is when the digital readout shows in the mid 40s that the larger discrepancies seem to show up.
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Old 09-17-2015, 10:27 AM   #8
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Does the thermistor probe in the fridge that is attached to the evaporator fins provide the temperature for the display?

Kelvin
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Old 09-18-2015, 08:21 AM   #9
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I'm prepping for a trip this weekend so the AS is home in the driveway hooked up to electricity. I decided to break out my wireless thermometer and check its display with the fridge display. I also have a second thermometer probe so I can compare all three thermometer. Fridge is empty and set on 5. This photo was taken late afternoon, full sun on the fridge wall, ambient temperatures in the mid 80's.

Looks like my fridge temperature display reads 2 to 3 degrees high. I wonder if there is a way to adjust the read out, but I'd rather show it higher than actual temperature if its going to be inaccurate.

Kelvin
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Old 09-18-2015, 10:30 AM   #10
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Try moving the thermostat clip on the fins to find the most accurate reading compared to a thermometer. Use the last three on the right till you find the closest reading.
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Old 09-18-2015, 10:50 AM   #11
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Right now that clip is on the last fin closest to the fridge wall. To make it read colder I should move it inboard? I'll try on this weekend's outing.

I also have it positioned about in the middle of the fin. I think I read if you position it differently you can make the fridge get colder or do I have that reversed?

Where I have the wireless sensor is on the top shelf on the away from the area of the probe.

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Old 09-18-2015, 05:06 PM   #12
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Mine isn't even on the fins, it's down on the side, I'll have to move mine and see if that makes a difference.
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Old 09-18-2015, 06:02 PM   #13
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I'm convinced, after literally decades of experimentation with 3 different fridges and 5 cooling units, that having the thermistor on ANY of the fins short cycles the on time and results in a warmer fridge. I put the white clip on the edge of the wire shelf (2nd from the top) and slide it fore and aft for adjustment. I do have "fin fans" as well.

I have found this to be best for even performance.

I also keep my external thermometer sender under the drip pan and adjust for 34* off and 37* on. If I keep the sensor out by the door, and adjust to that temp, stuff freezes in the back of the fridge.
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