Dometic Fridge Freezer Fault Model RM7605L

Gregors

Gregors

Joined
Feb 26, 2020
Posts
52
Likes collected
9
Funster No
69,017
MH
Pilote
Exp
2014
Hi All - I am new to the forum so wanted to say hello first - Hello !

I have the above fridge freezer in the motorhome that won't get cold at all - the power comes on, on the 240v 12V and Gas and I have even bought winter covers for the vents incase it was the cold - however this has not had any effect.

Does anyone have any ideas as to what the fault could be - where should I check first - have anyone else had the same or similar problem.

Thank you

Chris
 
I had a similar issue after a loss of coolant - this was terminal so hopefully someone will have a less expensive solution.

have you ever noticed a strange smell? (Ammonia?)
 
Hi and welcome
Is the motorhome level,fridge wont work if it's more than a few degrees out of level.

Patrick
 
Hi. Yes the MH is level and we have not smelt any Ammonia smells. It’s odd.
We did have someone look at it who thought the gas side of things needed a service and cleaned the flu. They did this and tested it saying itdroppped 5 degrees in temperature but really after a weekend of use there is no difference

can we get it re filled with the fluid if it’s that
 
Has the fridge never worked during your ownership or is this a recently occurring problem?

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Hi. No it did work and then stopped. We got someone out to look at it and they apparently fixed it and said it needed a service however I wasn’t there. My wife was there. We tried it over the weekend and it wasn’t working at all.
 
Gregors
If you paid for a repair should you not ask the engineer to return? Did they not give any guarantee on their work?

Surely you should give them the chance to examine their repair.

Good luck!
 
Hi yes they are coming back however can’t get back for a few weeks until the end of March and really need something before then so just wondering if anyone has had the same issue and there’s a quick fix thanks
 
Gregors said:
Hi yes they are coming back however can’t get back for a few weeks until the end of March and really need something before then so just wondering if anyone has had the same issue and there’s a quick fix thanks
Click to expand...
OK.

Sorry to hear that. Total failure on all three power sources seems odd. Hopefully some of the more knowledgeable members on the Forum may be able to make suggestions.
 
Cheers. Yes very odd as all three turn on but nothing gets cool

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I share mickyc's fears, having had the same ourselves, lost refrigerant gas which can not be mended, new fridge freezer best bit of £2000 once fitted and we found a discounted one :oops:

best of luck
 
It probably needs a 12v control feed to work on any of the 3 energy sources so check that out, ours is wired back to the 12v fuse box.
 
At the back of the fridge at the bottom of the cooling pipework is where the three heat sources are. Usually on the right. If you take off the lower vent grille, you should be able to feel if the pipes are getting warm. If there's no sign of heat, then the control board is not working, or the 12V power to it has failed.

If there is heat, then there's something wrong with the cooling circuit. if it's cooling a bit but not very much, the thermal paste between the cooling pipes and the metal inside the fridge/freezer might have dried out and lost contact.

As a last resort, before scrapping the whole thing, you could take out the fridge and stand it upside down for 24 hours. This has been known to get the fridge working again.

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Hi All,

Thanks all for your comments - I shall have a look on saturday as see what I can work out when I'm in front of the motorhome. Do hope its not a replacement though as it sounds quite costly. One other things I'm based in Shepperton Middlesex near J11/12 on M25. Can anyone recommend a good engineer if needed. Thanks Chris
 
Hi Just to confirm that the interior light on the fridge comes on when the door is open. As do the lights on the controls when I turn on the Gas, 12V, 240V or Auto - would this indicate that the power to the fridge is all O.K and there are no blown fuses before I go down that road.

I didn't get a chance to take the side vent off last night due to the rain and dark to check the pipes by the heaters

Many thanks Chris
 
Because of the working principle and method of construction of an absorption fridge the almost never (never heard of one) leak. If they did you would see liquid as well as possibly smell ammonia. A common fault explained to me by a Dometic engineer after my Tech Tower failed is caused by debris blocking a restricter in the cooling circuit. He had a theory that cheaper steel used in the cooling unit had inclusions that corroded when the refrigerant chemicals separated out during periods of non-use. One of the chemicals is saline and once separated it is corrosive. The symptoms are that the fridge suddenly stops working. Most times, if left for 24 hours before restarting, it will work correctly until next time it fails. Sometimes it'll work for a few weeks, sometimes for a few hours. A replacement cooling unit is the only answer if it is this fault.
 
I was talking to an old timer industrial absorption engineer when we had our fridge trouble. He said the blockages get in the u-tube, if you look on the left hand side of the condenser you'll see it (this is what you try and clear by turning it upside down) there should be additives in the refrigerants to stop internal rusting happening. He said some absorption systems work for years and years with no problems. And others go wrong while new, unpredictable and not a lot you can do about it ?

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Hi - thanks Tony /Richard, I shall have a look tomorrow and see what I can find from a small investigation. I must say I have already taken the unit out and turned it upside down. I left it for a week before turning it back and re installing it ! Almost dropped it on my Dad bless him :) Unfortunately it didn't work !

Tony I shall have a look into the replacement cooling unit as well as I am guessing it a lot cheaper option then a new fridge.

Chris
 
Mine did just this and it was the main circuit board £150 only way to find out is to try a new one . Easy to fit but get a dometic engineer to swap it no fix no fee before you regas or replace .
 
Hi Richard, so there could be light at the end of the tunnel...
We do have an engineer coming out towards the end of next month so was trying to come up with a solution before - maybe they can bring this part with them. Thanks Chris
 
Hi Have you checked the thermostat knob is not Brocken and not just turning on the shaft.
I have had this problem
Doug

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Hi Doug,

Good call - I shall check this - I did notice that it came off they other day when I was turning it so it would be worth a look for sure ! chris
 
Take it out turn it upside down , you should hear liquid trickling around , shake it around vigorously to mix up the chemicals . Leave for half an hour , turn right side up and reinstall leave for another half hour the try it on 240v it should be ok if its not lost pressure . This is not a joke it works , mine is 25 years old and it helped , I also took off the freezer door so I can,t keep any frozen stuff but my beers are well chilly ! Ps mine is an electrolux !

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