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Old 01-30-2019, 07:35 PM   #1
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Default Fridge too cold

My new RV has a Norcold DC558 fridge and even at the lowest setting (i.e. 1), everything almost freeze. Also, I have the impression that the compressor never stop. Should I hear the compressor cycle? This is my first experience with a RV and we are currently traveling so any help will be appreciated!

https://www.thetford.com/product/dc558/
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Old 01-30-2019, 08:17 PM   #2
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The compressor should cycle, I assume you have a capillary thermostat, see if the capillary tube, small copper tube, is intact. When you turn the thermostat know does it click (or use ohmmeter) at a point when the thermostat turns on the compressor. I would suggest to have Norcold folks fix it but later change to a 21st Century electronic thermostat.
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Old 01-30-2019, 08:46 PM   #3
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Thermostat would be the first suspect. However, they can run a lot even in cool weather conditions.

My Novacool 3.1cf (Danfoss compressor) works well and is very energy efficient. But the compressor runs practically all the time it seems. I mean it runs so much we notice the rare times it cycles off. The fridge is located next to the wet bath so it is quiet there and easier to notice the cycling. Getting up regularly at night is a fact of life for me now and even in cool temperatures (40-50 degrees) I hear it running the compressor surprising amount of time.

We've had a rare instance or two when fridge temperatures varied a little from desired parameters. Occassionally too warm to mid 40's or too cold and slightly freezing (only froze lettuce, never liquids), but we've rarely had to adjust the thermostat during a trip.

Good luck.
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Old 01-30-2019, 09:05 PM   #4
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Most of us would certainly not see the compressor frig run a lot of the time. Ours in cooler weather hardly runs at all, and at 100* in the sun right on it, it still cycled. If it is running all the time there is likely something wrong, but if it runs all the time and gets too cold, then I would agree it is likely the thermostat, and they have had issues with them.


If it has to run almost all the time to stay cool, you either have a bad frig or more likely, bad ventilation. Compressor frigs need to have good ventilation and that can be hard to get in a class b without extra fans.
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Old 02-01-2019, 11:51 PM   #5
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I noticed that when I turn the thermostat knob (Off - 1 - 2 ... 5), I can ear it click at 4 when turning it clockwise and at 3 when turning it the other direction. I'm correct to conclude that the thermostat works correctly? This lead me to conclude that the thermostat is working correctly, no? So the problem would be the control module. However, the compressor stop when I turn the knob to the off position.
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Old 02-02-2019, 12:09 AM   #6
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I noticed that when I turn the thermostat knob (Off - 1 - 2 ... 5), I can ear it click at 4 when turning it clockwise and at 3 when turning it the other direction. I'm correct to conclude that the thermostat works correctly? This lead me to conclude that the thermostat is working correctly, no? So the problem would be the control module. However, the compressor stop when I turn the knob to the off position.

When you turn the knob you are turning it on and off and you could run it manually that way. If the tube is kinked so shut off or mostly blocked, the thermostat won't get a signal of pressure from the cold bulb to move between on and off, even though the knob will still work. Same can be true if the gas has leaked out of the bulb and tube.


I would turn it to one position where the compressor is just turned on and let it run a while until cool. Then turn it down until it just turns off. Open the door for a while and see if it comes back on or not.
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Old 02-02-2019, 12:32 AM   #7
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But what are those clicks I heard? When it clicks at 4, it detects that I want a colder temp than current temp, no? And when it clicks at 3, it detects that I want a warmer temp than current temp, no? Thus the thermostat detect that the current temp is either too low or too high, no?

It just seems that the module is ignoring the signal.
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Old 02-02-2019, 12:40 AM   #8
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But what are those clicks I heard? When it clicks at 4, it detects that I want a colder temp than current temp, no? And when it clicks at 3, it detects that I want a warmer temp than current temp, no? Thus the thermostat detect that the current temp is either too low or too high, no?

It just seems that the module is ignoring the signal.

I am not familiar with what thermostat they use but normally you should be able to find 3 places that it clicks. One will be at one end or the other of the travel, probably at number 1 and that is the off position. Once you click away from that, should turn for a while and then click and that would be the on click for turning on compressor at the temp you are at. Turning it further will give no more clicks, but will make the frig colder before the compressor turns off. Once the compressor is on, and you have let the frig get colder, you should be able to turn the knob in the opposite direction until it clicks and that point should shut the compressor off. If it is not turning the compressor on and off, you could have a bad control board or the power to the thermostat is broken somewhere.
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Old 02-02-2019, 12:46 AM   #9
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I can heard the 3 clicks you described but unless to the Off position, the compressor runs. I left the door open for like 15 minutes and it now click at 3 and 2. Anyway, I don't have the tools or parts to fix it right now. Thanks for your help!
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Old 02-02-2019, 12:56 AM   #10
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Capillary bulb (sensor) is usually located on the cold plate so it reads the cooling element temperature, if it is detached from the cold plate it will sense wrong temperature and continue run the compressor. Electronic thermostats tend measure inside fridge temperature.

Can you see the bulb location?
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