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Old 10-03-2014, 03:39 PM   #111
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It's in a 6.7 -- Here is a picture of the best thermistor location I have found 'to date'. It was explained to me that if you are too far away your temperatures will vary because the thermistor is 'decoupled' from the fins.

I simply unscrewed the thermistor mount and jammed it under the drain chute. The blue tape is where I bared the wires to track changes with a volt/ohm meter.

I have found I can run our frig 1 power level lower with good stability.

Mel K
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Old 10-03-2014, 04:10 PM   #112
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Here is a picture of the best thermistor location I have found 'to date'. It was explained to me that if you are too far away your temperatures will vary because the thermistor is 'decoupled' from the fins.

I simply unscrewed the thermistor mount and jammed it under the drain chute. The blue tape is where I bared the wires to track changes with a volt/ohm meter.

I have found I can run our frig 1 power level lower with good stability.

Mel K
4.3 or 6.7 refer ?
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Old 10-03-2014, 04:28 PM   #113
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Hi: Klem... Thanks!!! I'm trying a few locations in the same area. So far I placed the sensor beside the wire of the shelf. I have some two sided tape to attach the plastic housing when I find the "Sweet spot".
We're in for 6 rainy days so I can chill out to my hearts content. Alf
escape artist N.S. of Lake Erie
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Old 10-03-2014, 04:39 PM   #114
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Just a few thoughts about the idea of moving the thermistor....As long as the ambient temperature is lower than the threshold at which the cooling system is inadequate, moving the thermistor may indeed result in the same amount of cooling for a lower setting on the control panel. That's not really accomplishing much. It's like putting an ice cube on a thermostat to make the furnace come on, only in reverse. In fact, I'm pretty sure you could take wire cutters to the thermistor so its resistance goes to infinity, the result being that the control system will call for maximum cooling forever. The fundamental problem of an undersized cooling system for higher ambient temperature remains, however.

So while you're chilling out with 6 days of rain, consider calling Dometic or Atwood!
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Old 10-03-2014, 05:13 PM   #115
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Hi: Parker... Seems like we are all on the carousel together. Everyone is on a different horse and all we know is we're going nowhere fast!!! I appreciate that Dometic needs to know of the plight of RM8XXX owners but in their present position I certainly wouldn't expect miracles.
In Harrisburg PA. last weekend I saw a RML8555 in CW. so they're still avail. for sale and being used for all RV's. where they fit. Alf
escape artist N.S. of Lake Erie
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Old 10-03-2014, 05:22 PM   #116
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Hi: Parker... Seems like we are all on the carousel together. Everyone is on a different horse and all we know is we're going nowhere fast!!! I appreciate that Dometic needs to know of the plight of RM8XXX owners but in their present position I certainly wouldn't expect miracles.
In Harrisburg PA. last weekend I saw a RML8555 in CW. so they're still avail. for sale and being used for all RV's. where they fit. Alf
escape artist N.S. of Lake Erie
Hi Alf,

I couldn't agree more about getting nowhere fast! I'm sure they're going to keep selling the RML8555; unfortunately, with predictable results for a lot of folks. Not that I'm getting discouraged or anything....
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Old 10-03-2014, 05:35 PM   #117
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Just a few thoughts about the idea of moving the thermistor....As long as the ambient temperature is lower than the threshold at which the cooling system is inadequate, moving the thermistor may indeed result in the same amount of cooling for a lower setting on the control panel. That's not really accomplishing much. It's like putting an ice cube on a thermostat to make the furnace come on, only in reverse. In fact, I'm pretty sure you could take wire cutters to the thermistor so its resistance goes to infinity, the result being that the control system will call for maximum cooling forever. The fundamental problem of an undersized cooling system for higher ambient temperature remains, however.

So while you're chilling out with 6 days of rain, consider calling Dometic or Atwood!
Actually using an adjustable thermistor, or moving it, is and effective way to raise/lower the box temperature. I purchased an adjustable thermistor that was the wrong resistance for the 8 series refrigs. I called the company and they suggested I move it up/down/away to raise the temperature of the box but not far enough that it 'decouples' and the temp varies.

The cooling unit has more capacity to cool then with the current fixed resistor, so I am getting additional cooling at a lower power setting.

If you look at Dometic Service Manuals for earlier models they have a section on moving the thermistor up/down or to the left to adjust the temperature. The 8 series has a fixed resistor so moving it is a valid way to adjust the temperature.

Check this out, the 'sliding thermistor' replacement.



But don't buy this adjustable thermistor if you have the 8 series, it's the wrong resistance.

Mel
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Old 10-03-2014, 05:53 PM   #118
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Hi Mel,

I'm not yet convinced. A different thermistor, or location, may increase cooling for a given setting on your panel, but I really doubt that there is any extra cooling available to solve the problem on really hot days. If this works for you, and you get plenty of cooling when it's well over 85 degrees outside, let us know, and I'll buy Alf a new thermistor!

Parker
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Old 10-03-2014, 06:48 PM   #119
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Well Parker you have me over the barrel... So to speak. We won't see 85 degrees unless the house is on fire!

Going south in February so we'll see then ... But hopefully there will be an x20 cooling unit hanging on back of this 6.7

Mel
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Old 10-03-2014, 06:57 PM   #120
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Hi: Klem... The fridge is cooling rapidly at 20*C. today. Empty refer at 20C* door open, turned on at 2:30 w/ thermistor set on wire rack in right rear corner. Temp in the box at 6:30 4*C. Running 120V on 5 bars. I'll check it tomorrow and adjust to lower setting where necessary.
Parker... The proof in the pudding will be in Feb. when we get to Florida. At least if we need a new refer CW will have another one!!! I'm trying as much as I can to keep my cool.
Question still remains...Why does the temp in the refer climb so high when we're towing? Alf
escape artist N.S. of Lake Erie
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