RV.Net Open Roads Forum: Tech Issues: Fridge warming up overnight

RV Blog

  |  

RV Sales

  |  

Campgrounds

  |  

RV Parks

  |  

RV Club

  |  

RV Buyers Guide

  |  

Roadside Assistance

  |  

Extended Service Plan

  |  

RV Travel Assistance

  |  

RV Credit Card

  |  

RV Loans

Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Posting Help and Support  |  Contact  

Search:   Advanced Search

Search only in Tech Issues

Open Roads Forum  >  Tech Issues

 > Fridge warming up overnight

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 2  
Next
Sponsored By:
MalibuDave42

Colorado

New Member

Joined: 09/13/2020

View Profile


Offline
Posted: 09/21/20 10:53am Link  |  Quote  |  Print  |  Notify Moderator

Dometic DMR702. No error codes. On shore power or propane, fridge\freezer cools down. Seems to work great during the day. Temps 34'ish and -2.5'ish, right on target. Overnight, the temps go up a bit.. 42-45, 8-10. As the day warms up, the fridge gets going to bring the temps back down.

- I did the "unplug from controller board, 120v directly plug in the AC heater" test - brought the temp right in line.
- I replaced the tank pigtails and the switching propane regulator (it was not putting out enough propane to support all devices). Tests out fine now.
- I replaced the igniter\thermocouple.. was time to replace it.
- The flame is a nice blue quarter sized -- looks great.

It seems something is telling the controller, the temp is good. Any thoughts are greatly appreciated.

rrupert

NW PA

Senior Member

Joined: 02/26/2005

View Profile


Offline
Posted: 09/21/20 11:18am Link  |  Quote  |  Print  |  Notify Moderator

Did you uplug the thermocouple to see if the fridge goes into the emergency cooling mode?


Rich and Joyce
2018 Jayco Jay Flight 21QB
2012 Ford F150 4X4 Supercrew EcoBoost
Reese Strait-Line Dual Cam Hitch
Amateur Radio K3EXU


wopachop

Who run bartertown

Senior Member

Joined: 11/17/2006

View Profile


Offline
Posted: 09/21/20 11:20am Link  |  Quote  |  Print  |  Notify Moderator

Could it be related to the auto defrost setting?
Do you have a little thermometer in there tracking temps? The graph could tell you a lot about how often and how long the cooling cycles last.

Old-Biscuit

Verde Valley

Senior Member

Joined: 06/20/2009

View Profile



Posted: 09/21/20 11:58am Link  |  Quote  |  Print  |  Notify Moderator

That model does not have 'defrost' mode
That model is equipped with an automatic Low Ambient Control (LAC) function
*turns food compartment light ON when ambient air temps drop below 50*F ---- no on/off switch (light causes a heat load so thermostat calls for longer heat cycles/colder temps
That model only has 3 temp setting.....narrow range control

You have proven cooling unit functions properly (Direct wiring of element)

SO......
Unplug the thermistor leads from lower circuit board (P2 connector at J3 --- S/B white leads)
Run fridge overnight w/o thermistor sensing and fridge temps should go down and stay down
If they do replace the thermistor

Snip-The-Tip Rheostat thermistor replacement


Is it time for your medication or mine?


2007 DODGE 3500 QC SRW 5.9L CTD In-Bed 'quiet gen'
2007 HitchHiker II 32.5 UKTG 2000W Xantex Inverter
On the Road Debt Free April '07
Off the road still Debt Free Jan. '14

MalibuDave42

Colorado

New Member

Joined: 09/13/2020

View Profile


Offline
Posted: 09/21/20 02:09pm Link  |  Quote  |  Print  |  Notify Moderator

For $29, I'm just replacing the thermistor. New snip the tip on the way. Back to you all soon. Thanks for the advice..

FWIW, I installed Fridge Defend by Arp with internal and external fans to provide more safety\control of the burner... lovin' that device

wa8yxm

Wherever I happen to park

Senior Member

Joined: 07/04/2006

View Profile


Offline
Posted: 09/21/20 04:44pm Link  |  Quote  |  Print  |  Notify Moderator

I would be inclined to think the outside coils and stack need cleaning.
This is described more or less in your owner's manual. I've never done it.

Sun heat on the outside increases air flow up through the coils is my guess

I'd remove upper and lower covers, blow air DOWN (Carefully and straight) to clean the coils Make sure the coils do not end and close off.

Stack cleaning is described in the manual I hope.


Home is where I park it.
Kenwood TS-2000 housed in a 2005 Damon Intruder 377


Old-Biscuit

Verde Valley

Senior Member

Joined: 06/20/2009

View Profile



Posted: 09/21/20 09:10pm Link  |  Quote  |  Print  |  Notify Moderator

wa8yxm wrote:

I would be inclined to think the outside coils and stack need cleaning.
This is described more or less in your owner's manual. I've never done it.

Sun heat on the outside increases air flow up through the coils is my guess

I'd remove upper and lower covers, blow air DOWN (Carefully and straight) to clean the coils Make sure the coils do not end and close off.

Stack cleaning is described in the manual I hope.


OP posted fridge works great during daytime BY+UT warms up at night
*night ---sun goes day ambient air temps drop

Re-read OPs 1st post

MalibuDave42

Colorado

New Member

Joined: 09/13/2020

View Profile


Offline
Posted: 09/25/20 03:43pm Link  |  Quote  |  Print  |  Notify Moderator

Old-Biscuit, a question about your Thermistor test. When you unplug the Thermistor, the control must be reading the temp as "too warm, keep running." Is this correct? If yes, does this mean the boiler\refrigerant runs continuously until there is manual intervention (aka it's manually turned off)?

How will this test answer the question about not staying cold overnight?

WRT to Snip-the-tip. It will be no problem to install. But, how will I know if it is working? Should I monitor the temp, keep adjusting the dial until the temp is correct?

Thanks for your insights

Edd505

Elephant Butte, NM

Senior Member

Joined: 05/20/2015

View Profile



Good Sam RV Club Member

Offline
Posted: 09/25/20 08:24pm Link  |  Quote  |  Print  |  Notify Moderator

Old-Biscuit wrote:

That model does not have 'defrost' mode
That model is equipped with an automatic Low Ambient Control (LAC) function
*turns food compartment light ON when ambient air temps drop below 50*F ---- no on/off switch (light causes a heat load so thermostat calls for longer heat cycles/colder temps
That model only has 3 temp setting.....narrow range control

You have proven cooling unit functions properly (Direct wiring of element)

SO......
Unplug the thermistor leads from lower circuit board (P2 connector at J3 --- S/B white leads)
Run fridge overnight w/o thermistor sensing and fridge temps should go down and stay down
If they do replace the thermistor

Snip-The-Tip Rheostat thermistor replacement


This is your resident expert, he's helped me with a Norcold cooling issue. Always good advice.


2015 F350 FX4 SRW 6.7 Crew, longbed - 2017 Durango Gold 353RKT
2006 F350 SRW 6.0 crew longbed sold
2000 F250 SRW 7.3 extended longbed airbags sold
2001 Western Star 4900EX sold
Jayco Eagle 30.5BHLT sold, Layton 24.5LT sold


MalibuDave42

Colorado

New Member

Joined: 09/13/2020

View Profile


Offline
Posted: 10/02/20 05:36pm Link  |  Quote  |  Print  |  Notify Moderator

My clip-the-tip still has not arrived. ?? I've been using the fridge as is. It's limping along. Fridge temp goes to the low 30's then sails into the mood to high 40's. What are your thoughts on this temperature pattern: [image]

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 2  
Next

Open Roads Forum  >  Tech Issues

 > Fridge warming up overnight
Search:   Advanced Search

Search only in Tech Issues


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:




© 2020 CWI, Inc. © 2020 Good Sam Enterprises, LLC. All Rights Reserved.