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08-20-2020, 08:19 AM
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#1
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Rivet Master 
1994 34' Excella
Warren
, Manitoba
Join Date: Apr 2006
Posts: 1,253
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Freezer Ice cold, fridge hot HELP
My freezer is ice cold and fridge part is hot. Took a thermistor reading on my ohm meter, 200K ohms setting it is reading 3.3. Internal fridge temp is 73 F. Does this indicate a bad thermistor? I have tried moving the thermistor up to the highest point on the coils, but no luck. It has been hot here, but have both internal and external fans running. Any thoughts really appreciated!! Thank you, Chris.
__________________
ACI #7394
2012 GMC 2500 HD Duramax Denali
1994 Excella 34'
1987 Limited 34', 1976 31', 1976 Argosy 22' Gone to new homes
Hensley Hitch
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08-20-2020, 10:20 AM
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#2
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Rivet Master
1994 34' Excella
Warren
, Manitoba
Join Date: Apr 2006
Posts: 1,253
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The fridge is a Dometic RM3807. Anybody have any ideas????
__________________
ACI #7394
2012 GMC 2500 HD Duramax Denali
1994 Excella 34'
1987 Limited 34', 1976 31', 1976 Argosy 22' Gone to new homes
Hensley Hitch
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08-20-2020, 10:37 AM
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#3
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Site Team
2007 30' Classic S/O
Somewhere
, South Carolina
Join Date: Apr 2010
Posts: 6,436
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From Dometic Refrigerator Performance Testing doc.
"Check the ohms value of the thermistor. In a glass of ice water at approx. 34 degrees F you should see between 8,500 and 9,000 ohms +/- 10%"
Was your reading 3.3K ohms?
https://myrvworks.com/wp-content/upl...ce-Testing.pdf
__________________
S/OS #001 2005 Dodge Ram 2500 5.9L 6 Speed
16" Michelins, Hi Spec Wheels, Max Brake, Dexter 4 Piston Disc Brakes, Carslile Actuator, Equal-I-Zer, Dill TPMS. Campfire cook. BMV-712. DEMCO 21K Lb Cast Iron coupler
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08-20-2020, 10:59 AM
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#4
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Rivet Master
1994 34' Excella
Warren
, Manitoba
Join Date: Apr 2006
Posts: 1,253
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Just did the test with ice water, 8400 ohms!! I am wondering if it is the board. It's a dinasaur board. I can't remember if I replace it or if it was in the 1976. Do you think it could be a board problem? Thanks for the quick reply.
__________________
ACI #7394
2012 GMC 2500 HD Duramax Denali
1994 Excella 34'
1987 Limited 34', 1976 31', 1976 Argosy 22' Gone to new homes
Hensley Hitch
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08-20-2020, 11:16 AM
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#5
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Site Team
2007 30' Classic S/O
Somewhere
, South Carolina
Join Date: Apr 2010
Posts: 6,436
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Chris
That sounds like right on the numbers.
Currently running AC or gas?
Door seal?
Are you on the road right now need fridge ASAP?
Gary
__________________
S/OS #001 2005 Dodge Ram 2500 5.9L 6 Speed
16" Michelins, Hi Spec Wheels, Max Brake, Dexter 4 Piston Disc Brakes, Carslile Actuator, Equal-I-Zer, Dill TPMS. Campfire cook. BMV-712. DEMCO 21K Lb Cast Iron coupler
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08-20-2020, 11:28 AM
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#6
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Rivet Master
1994 34' Excella
Warren
, Manitoba
Join Date: Apr 2006
Posts: 1,253
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Been on the road and just got home yesterday. Came home early because of fridge problem. Have been on both AC and propane, with no difference. Door seals are good! Will head to Winnipeg after lunch and get a new board. Have to get back on the road Saturday at the latest, as Brother-in-law is in hospital and terminal. Wife left last night and I will follow as soon as fridge fixed. Thank you for the help!
__________________
ACI #7394
2012 GMC 2500 HD Duramax Denali
1994 Excella 34'
1987 Limited 34', 1976 31', 1976 Argosy 22' Gone to new homes
Hensley Hitch
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08-20-2020, 11:40 AM
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#7
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Site Team
2007 30' Classic S/O
Somewhere
, South Carolina
Join Date: Apr 2010
Posts: 6,436
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Chris
How does this unit know cool freezer more and less cooling to fridge?
It’s one system divided by its own design, right?
Gary
__________________
S/OS #001 2005 Dodge Ram 2500 5.9L 6 Speed
16" Michelins, Hi Spec Wheels, Max Brake, Dexter 4 Piston Disc Brakes, Carslile Actuator, Equal-I-Zer, Dill TPMS. Campfire cook. BMV-712. DEMCO 21K Lb Cast Iron coupler
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08-20-2020, 01:39 PM
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#8
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Rivet Master
1986 31' Sovereign
Miami
, Florida
Join Date: Feb 2004
Posts: 3,137
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When my RM 2820 did that I had to replace the cooling section with rebuilt as there was a blockage (probably corrosion) in the tubing after the freezer section.
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Sorta new (usually dirty) Nissan Titan XD (hardly paid for)
Middle-aged Safari SE
Young, lovely bride
Dismissive cat
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08-20-2020, 01:54 PM
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#9
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Site Team
2007 30' Classic S/O
Somewhere
, South Carolina
Join Date: Apr 2010
Posts: 6,436
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OK folks, for your reading pleasure 112 pages of Dometic fridge training info.
https://myrvworks.com/wp-content/upl...r-Training.pdf
Courtesy of Darren at My RV Works.
Gary
__________________
S/OS #001 2005 Dodge Ram 2500 5.9L 6 Speed
16" Michelins, Hi Spec Wheels, Max Brake, Dexter 4 Piston Disc Brakes, Carslile Actuator, Equal-I-Zer, Dill TPMS. Campfire cook. BMV-712. DEMCO 21K Lb Cast Iron coupler
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08-20-2020, 04:19 PM
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#10
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Rivet Master
1994 34' Excella
Warren
, Manitoba
Join Date: Apr 2006
Posts: 1,253
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I went and picked up a new "board". Have a very good independent RV tech that I have worked with a lot in the past, and told him my problem. symptoms, and reading. He is quite sure that it is the board failing. Will install tomorrow morning when it's a bit cooler and see what happens!! Thanks to all for the thoughts, and that is a very good video, GCinSC2. Will save that for future reference.
__________________
ACI #7394
2012 GMC 2500 HD Duramax Denali
1994 Excella 34'
1987 Limited 34', 1976 31', 1976 Argosy 22' Gone to new homes
Hensley Hitch
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08-21-2020, 12:08 PM
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#11
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Don McKelvay
1994 34' Limited
London
, Ontario
Join Date: Feb 2002
Posts: 126
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Hopefully your new board will solve the problem as a hot fridge is really a problem. I too have a 1994 footer and have a similar problem except it does not work on gas and I had to bypass the board hooking up the heating element directly to 120v and everything is working. But I am guessing my board also needs to be replaced. What did your new board cost and is it a dinasaur board? Part number? Not sure what the differences are between a dinasaur and OEM board. All help appreciated.
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________________
Don McKelvay
WBCCI #205 
AIR #42
1994 34' Limited
2004 GMC 2500 HD
Hensley Hitch
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