Dometic RM2553 Refrigerator

Submitted: Tuesday, Jan 22, 2008 at 21:57
ThreadID: 53801 Views:7027 Replies:4 FollowUps:2
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After 2 months of not using our 2 year old van we arrived at a caravan park yesterday. We have a digital thermometer in the Dometic frigde and it went down to 5 degrees this morning and ever since it has progressively risen to 17 degrees. Last holiday it was fine.

The 3 way fridge is operating on 240 VAC which I have measured at the power point. Also checked the resistance at the power plug - 327 Ohms which indicates the heater is correct and the thermostat is on. The boiler is getting hot. It is not a ventilation problem as the weather is very cool.

Has the fridge lost its gas? What other checks can I do, pleasde?

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Reply By: GerryP - Tuesday, Jan 22, 2008 at 22:27

Tuesday, Jan 22, 2008 at 22:27
Hi Glenn,
Assuming it is perfectly level (they are quite fussy and won't work properly on even a slight tilt) and the flue is clean and clear (check for bugs or cobwebs), then there is a possibility that the gases in the unit have separated. The gases are ammonia, water and a squirt of hydrogen. To fix this, remove the unit and place upside-down for a day or two. Sometimes shaking it around a bit helps as well. This often gets them going by mixing all the gases together again.

Unfortunately, if any gas has escaped (and it's always the hydrogen that goes first), then there's not much you can do. There are some technicians around that fix them, but getting scarce and hard to find.

Good luck
AnswerID: 283215

Reply By: goldiedingdangdo - Tuesday, Jan 22, 2008 at 22:30

Tuesday, Jan 22, 2008 at 22:30
Is the freezer working but the cabinet not?
1.If so it is probably the cooling unit.
2.If not the you may have a blokage in the circulatory system which may require removing the fridge turning it upside down to backflush any blockage and hopefully away you go. If not back to stage 1.
You may also have a mudwasp nest of something similar in the exhaust tube.
Have heard and seen some funny things, best thing is with these fridges to keep them running all year round but of course not always possible.

AnswerID: 283216

Follow Up By: Sacred Cow - Wednesday, Jan 23, 2008 at 10:02

Wednesday, Jan 23, 2008 at 10:02
Thanks. This mornings readings are:

Main compartment +11.5 degrees C
Freezer: -18.4 degrees C

So the freezer looks OK but not so with main compartment.

FollowupID: 547881

Reply By: Wizard1 - Wednesday, Jan 23, 2008 at 10:12

Wednesday, Jan 23, 2008 at 10:12
It could be a buggered thermostat. Found the same problem with ours when run on gas.

These fridges do not use normal refirgderator gas but ammonia. You need to run them regularily to keep the ammonia active.

Two months shouldn't make much difference. We leave our 8 YO van o blocks for months without runnng the fridge and t has been fine.

Get a 3 way fridge expert to look at it. That is the only real way you will solve the problem.
AnswerID: 283270

Follow Up By: Wizard1 - Wednesday, Jan 23, 2008 at 10:13

Wednesday, Jan 23, 2008 at 10:13
Just a PS. The freezer and fridge are seperate units and don't both run off the same thermostat.
FollowupID: 547882

Reply By: Faulic_McVitte - Wednesday, Jan 23, 2008 at 11:48

Wednesday, Jan 23, 2008 at 11:48
There is a Dometic guy on the Caravan forum who helps out on fridge problems.
AnswerID: 283291

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