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Old 11-08-2010, 09:11 PM   #1
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Unhappy Dometic fridge problem

Anyone got an answer to this problem?


DOMETIC
MODEL: RM7732
PROD #: 921-14 80-08
S/N: 64500248

The problem:
Check light comes on and system is switching between gas and a/c and not stopping on either service. This continues with a switch off & on again. The inside light dims slightly as it switches between gas & a/c. Mains power is stable at 120V and does not drop below 110V when other mains appliances are started and running. 12V supply is good and 4 new house batteries were installed 6 months ago.
If the fridge is left off for approximately 2 hours it starts up again and runs normally. It switches properly between gas and a/c. When the problem arose about 2 weeks ago it would run for about 2 days before the problem arose again and for the last two faults it seems to be running somewhat longer, e.g. failed late Oct31, ran until late Nov04 (4 days) and has been running until now, 9am Nov08 (another 4 days).
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Old 11-09-2010, 06:16 PM   #2
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Sounds like the control board is circling the drain. It would be a good idea to take the fridge in to be checked out before it checks out.
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Old 11-10-2010, 04:23 AM   #3
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I too suspect a faulty control board. It could be as simple as a cold solder joint on the backside of the board. If it were me; I would remove the board and have a close look under a magnifying glass at the soldering of components. If you are not familiar with this, try a local TV repair shop to do this for you. Good luck and keep us posted.
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Old 11-11-2010, 03:29 PM   #4
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Mike: Thanks for your comments. I like the possibility of the solder connections on the electronic and will look at that at the earliest opportunity. Also think I may be getting on to it as this morning when I turned on the 12V fluorescent light closest to the galley the Dometic started up on its error - flicking between gas and a/c. When I turned the flouro off the Dometic went back to normal. The flouro on the other side had no effect so I am assuming that a) any filtering that the flouro had is not working, b) the flouro needs some power filtering and c) the reason the other flouro had no effect is that maybe it had good filtering or it is on a different 12V circuit.
Aside from the foregoing Mike do you, or anyone, know what type of filtering device I can add to the fluoros.
Really appreciate your help and happy happy RVing fo all.

Cheers
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Old 11-12-2010, 04:10 AM   #5
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I would recommend replacing the light fixture; it can't be that much more, than trying to treat symptoms.
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Old 11-13-2010, 08:51 AM   #6
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Mike: right on the button Sir! 99% it is the fluoro. Day before yesterday the Dometic went into the fault mode while the suspect fluoro was on and then went back to normal when the fluoro was switched off so we stopped using the fluoro. Late yesterday, Dometic running normally I changed the fluoros over and the suspect fluoro faulted the Dometic from its relocation. Other fluoro had no affect so it was nothing to do with different circuits the fact that one fluoro and not the other could be the problem. This wa the first time I had seen the start of the Dometic going out and the fact that I switched off the interfering device was maybe the reason the fridge did not go to the 'check' and need the 2 hours rest. Will replace the fluoro today.
I don't like it that a fluoro going well and all can suddenly be putting out this sort of interference. I talked to a techo working on a nearby RV yesterday and he thought that Dometic had come out with a patch device of some sort for their fridges - anyone know anything about that?
I also believe from getting rid of interference in maritime systems that chokes and/or capacitors can be used - does anyone have any information on that.

Cheers all
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Old 11-14-2010, 04:37 AM   #7
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Chokes can be used but why only treat a symptom; instead of repair the cause?
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Old 11-15-2010, 08:06 AM   #8
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THANKS

Thanks Mike for your comments and standing by on this one. Will definitely replace the lamp but I still believe that manufacturers like Dometic should design their 12V electronics so that they protect against reverse connection and the types of interference that can arise in the users environment. Dometic I believe know of this problem and I am told produced a fix some years ago and maybe their current products have the sort of protection I describe.
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Old 11-15-2010, 08:51 AM   #9
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With regards to interference from florescent overhead lights, I fought an intermittent problem with false indicators on my Tank & Battery Level System panel in addition to false indicators on my Intellitec EMS system panel at the very same time when using a faulty light over the kitchen sink. Originally, the light was fine, but one day I noticed these intermittent faults. Took a long time to trace it down and happen to stumble upon it one day when I was checking tank levels and my wife turned on the kitchen light at the very same time. I had just dumped the tanks and knew they were empty but the panel said they were 3/4 full. After a minute or two with some testing, we verified that the florescent light ballast was causing the faulty indicators.

Replaced the entire Thinlite fixture and no more problems.

Dr4Film ----- Richard.
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