Fridge: Okay on AC power, no-go on LP - Fiberglass RV


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Old 04-23-2017, 02:25 PM   #1
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Name: Mark
Trailer: Curently Shopping
Ohio
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Fridge: Okay on AC power, no-go on LP

I'm about to start troubleshooting the fridge on our Casita (a Dometic "Americana" RM 2453, AC and propane only). It works fine when hooked up to shore power, but doesn't get cold at all on propane. It would light with the built-in ignitor, but wouldn't stay lit after releasing the "start button" valve unless I "fooled" the thermocouple by adding heat using a butane lighter for 30 seconds. Then it stays lit, but won't cool.

With the LP going, there seems to be quite a bit of heat coming out of the top "flue" vent, more than when it is on AC. But, still the fridge isn't cool at all.

My next steps:
- Assume maybe the gas isn't putting out enough heat after all. I'll rig up a manometer and check my pressure and also clean the orifice fort he fridge. The LP water heater seems to heat fine and the stove burner flames look okay, but I suppose the pressure might still be low.

Is there a common problem that I'm overlooking, or something else I should try first? I haven't taken apart the portion of the fridge under the shroud where the AC and LP apply heat to the refrigerant fluid.

Thanks.

Mark.
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Old 04-23-2017, 03:01 PM   #2
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Similar ..... ?

Dometic RM2410.2RX

Dometic RM2410.2RX

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Old 04-23-2017, 04:56 PM   #3
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On my 2193 when the gas lights but the fridge doesn't get cold it's time to clean the burner.
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Old 04-23-2017, 05:24 PM   #4
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Take the gas tube apart and clean everthing. You may have a spider nest in the orfice and it's not letting the gas through. Remember it's low pressure.
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Old 04-23-2017, 09:44 PM   #5
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When this happens to me I have to get into the burner and clean up the inside of the burner and the orfice that feeds the burner. There are some little tiny ass spiders that spin the finest webs in there and while the burner may light there just isn't the proper flame. If the regulator is old dont waste time fooling with it just replace it. When I got my old trailer there was tar like residue in the coper tube that needed to be flushed out. Any of that stuff goes down the line the fridge will have issues.
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Old 04-24-2017, 04:12 AM   #6
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Name: Gerry
Trailer: 1979 Boler 1300 / 1991 Casita Freedom Deluxe
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After all said it sounds that your fridge works so the refrigerant is still entact and if there was good heat in the chimney the burner is working also.
Is there a seperate Thermostate for AC and Propane on back of fridge?
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Old 04-24-2017, 06:55 AM   #7
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the fridge is the only gas appliance that does not have a built in propane regulator...it relies on the pressure provided by the regulator at the tanks.

the orifice in the gas line at the burner tube is tiny and can become blocked partially or totally.

i would expect that perhaps one of these may be the source of your issues.

the first is remedied with a new regulator (you can test with a nanometer if you have one and know how to use it).

the other requires cleaning the orifice. consult your owners manual for info on how to accomplish this. do not try to clean that tiny hole with anything except air and alcohol (denatured). the synthetic ruby is very fragile.

p@
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Old 04-24-2017, 12:21 PM   #8
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P@.

Thanks for saving me all the typing. (that's my usual reply almost exact to the wording)

Mark
What year is your Casita? Cleaning the jet and fire tube are yearly maintenance items.

Joe
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Old 04-24-2017, 03:47 PM   #9
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Not exactly related but 30 yrs. ago I bought a very used Class C shell. It belonged to a clothing salesman and he had removed everything including the refrig. and put in hangers for his merchandise. He had kept the refrig. and gave it to me. Installed it and it lit up just fine. Went into the house for a couple of minutes and when I returned, flames were coming out the vents on the side of the camper. After shutting off the propane and a good watering down, I found a very small split in the copper tubing that I had over looked. Should have let the thing burn to the ground. It was nothing but trouble.
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Old 04-24-2017, 08:15 PM   #10
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Well, the fridge is cooling on propane now.

I did two things (cleaned out the burner tube and cleaned the orifice), so I can't say which did the trick. No really obvious problems (webs, spiders, tons of gunk, etc). It doesn't appear to be cooling as rapidly as it was on AC power, but the freezer is cold, I'll see if water freezes tonight.

Joe,
It is a 1999 Casita, but I bought it a few months ago, so don't know when the refrigerator maintenance was last done. The trailer is in good shape, though.

Thanks for the assistance and patience.

Mark
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Old 04-24-2017, 08:56 PM   #11
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Name: Jann
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Quote:
Originally Posted by samclem View Post
Well, the fridge is cooling on propane now.

I did two things (cleaned out the burner tube and cleaned the orifice), so I can't say which did the trick. No really obvious problems (webs, spiders, tons of gunk, etc). It doesn't appear to be cooling as rapidly as it was on AC power, but the freezer is cold, I'll see if water freezes tonight.

Joe,
It is a 1999 Casita, but I bought it a few months ago, so don't know when the refrigerator maintenance was last done. The trailer is in good shape, though.

Thanks for the assistance and patience.

Mark
These fridges don't get cold as fast on propane as on electric. We always chill the fridge for several hours before loading in food when leaving on a trip. It helps with the stress of cooling down the fridge. It also saves a lot of propane doing this. You are lucky. We had one that didn't work on propane and had to replace the fridge. The dealer paid for half of the cost so we know it was a bad fridge.
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Old 04-25-2017, 06:09 AM   #12
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Don't forget the chimney. Build up there can flake off and land on the burner.
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Old 04-25-2017, 06:34 AM   #13
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We found that the vent cover didn't allow enough heat to escape so if we remove the vent cover it works better. Adding a fan is even more effective. Ours is a retrofit on a Captain trailer, not installed by the manufacturer of the trailer.
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Old 04-25-2017, 03:53 PM   #14
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These fridges have installation instructions and if you follow the instructions they will work much better than just sticking them into a cut out. There are certain clearances that have to be maintained for the air to properly draw through the cooling coils/fins. Make sure the air-box is sealed to the outside vents you don't want to be breathing exhaust inside the trailer.

I pulled the cook-top out of my Scamp and the taped together ducting for the fridge had failed and had to be redone. That alone helped my fridge work much better.

With these fridges every little thing counts.
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