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Open Roads Forum  >  Tech Issues

 > Dometic fridge not cooling on LP. Just LP.

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NKnowland

California

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Posted: 05/09/21 03:23pm Link  |  Quote  |  Print  |  Notify Moderator

The fridge/freezer works great on AC and DC.
The freezer works great on LP.
The fridge sucks on LP..

So this is only an issue on the LP side that just impacts the fridge.

The burner unit was cleaned/inspected professionally. Good flame. Manometer 11.1. New baffle. Air blow to clean flue.

What else is there to try???

bgum

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Posted: 05/09/21 04:01pm Link  |  Quote  |  Print  |  Notify Moderator

Put small fan in bottom of fridge. Give your unit more time to cool.

NRALIFR

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Posted: 05/09/21 04:28pm Link  |  Quote  |  Print  |  Notify Moderator

I’d get a second opinion on that burner, or buy a manometer and check the LP pressure myself. It should be at least 11” wc WITH the LP system loaded about 50%, which means you ought to be running the furnace and water heater while checking the pressure.

I just noticed you said new baffle, so I removed that suggestion.

Seriously, check the LP pressure again. The flame can LOOK good, but still be too low btu-wise.

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ksg5000

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Posted: 05/09/21 04:31pm Link  |  Quote  |  Print  |  Notify Moderator

Fridge sounds like it works fine - you just need to develop patience. Let it cool overnight and then check. Quit opening the door and checking - buy a remote thermometer if you feel you have to monitor. Common problem for new RVers.


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Posted: 05/09/21 04:34pm Link  |  Quote  |  Print  |  Notify Moderator

Make sure the flame is going up the center of the tube.


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Posted: 05/09/21 04:36pm Link  |  Quote  |  Print  |  Notify Moderator

I’ve used a battery operated fridge fan since 1978. Try one.


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enblethen

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Posted: 05/09/21 05:20pm Link  |  Quote  |  Print  |  Notify Moderator

What was the issue for the "professional cleaning and baffle" replacement?
What is the distance between the exterior wall and the cooling unit?
Exact model number of refer?


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Old-Biscuit

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Posted: 05/09/21 05:55pm Link  |  Quote  |  Print  |  Notify Moderator

Freezer/Food compartment get cold on AC element and stays cold on DC element
But freezer only gets cold (not the food compartment) when using GAS

That means GAS is NOT generating ENOUGH hot ammonia vapor.....
Low LP System Pressure causes cool gas flame cause insufficient boiling of ammonia into hot vapor
*freezer is first in coolant flow......freezer gets cold cause there is enough absorption but not enough for food compartment

LP System Pressure OR obstructed burner orifice inhibiting the gas flow to burner



Side note:
'Fridge'----that is the whole unit Freezer AND food compartment
'Fridge' is short for Refrigerator


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BFL13

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Posted: 05/09/21 06:06pm Link  |  Quote  |  Print  |  Notify Moderator

It is not the thermistor because it works ok on 120v?

Does the light come on when you open the door? ISTR that is related to the thermistor getting 12v. Vague on that!


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NRALIFR

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Posted: 05/09/21 07:02pm Link  |  Quote  |  Print  |  Notify Moderator

Old-Biscuit wrote:

………
LP System Pressure OR obstructed burner orifice inhibiting the gas flow to burner
……….


That’s a good point, an obstructed orifice could result in the same symptoms as low LP pressure. Soak it in alcohol then blow it out to clean it, or just replace it.

It’s clearly an issue of not enough heat BTU’s are going into the cooling unit when running on LP, so the cooling unit performance is degraded. On mine, the flame produced with low LP pressure looks virtually the same as the flame produced with correct pressure. The only thing that’s noticeably different to me is the SOUND the flame makes. When the pressure is low, it’s almost silent. When the pressure is correct I can hear the flame without even removing the outside panel. I didn’t even realize that until I bought a manometer and adjusted the LP pressure myself. After adjusting it and hearing the flame, it was an “Oh yeah, I remember that sound now” moment for me.

And yes, get a wireless fridge thermometer that will let you monitor the fridge and freezer temps without opening the doors. My fridge, which is probably smaller than the average fridge because it’s in a truck camper, will cool down quite rapidly on AC or LP when it’s working right. When something is wrong, I can tell pretty quickly.

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