Fridge buzzing on 12v (1 Viewer)

[paddymcc]

Our Dometic AES fridge RM7655 has started making a rapid buzzing/clicking on 12v -it comes on just after the engine starts. The green light for 12v operation changes to orange in time with the noise. The fridge still seems to be working. I suspect it is a faulty connection/relay clicking on and off. It seems to be coming from behind the control panel at the top. (I read another thread about a relay at the back being a problem but don't think that the noise is coming from the back).
Anyone know how to get the control panel off-no obvious screws so I suspect that it just clips on but don't want to force it.
Paddy

 

[namwaldog]

Anything in this document (Service Manual) that would help??

https://www.4mcculloch.co.uk/images/mediator/559/599523023.pdf

 

[paddymcc]

Thanks a lot @namwaldog
Page 17 -pull off the control nobs and undo the screws concealed beneath. I think you saved me from breaking the control panel cover.
Now I've got to try and find what's causing the noise. No doubt I will be back!

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[J&S]

Hey mine had just started doing the same.. makes a hell of a noise... got the controller panel off . But the fault is intermittent so sods law it's stopped making the noise when I got a repair man to look at it.
Think I'll have to get a new printed circuit board , feel fairly sure it's a component on the board or
Have you solved it yet? @paddymcc

John

 

[paddymcc]

Hi John @J&S
Not solved it yet.... I took the control board panel of but without taking the fridge out I can't locate the noise. It does seem to be coming from that area.
Will keep you posted if I can solve it. Otherwise it may be a trip to Dave Newell.
Cheers
Paddy

 

[J&S]

Ok Paddy... Funny it all works normally just buzzies when on 12v ..
I'll let you know if I discover a solution...
Have fun. John

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[paddymcc]

Hi @J&S
Just to let you and anyone else know that I did solve the problem :it was the relay at the back of the fridge clicking on and off as the voltage dropped intermittently due to an iffy fuse -the 12v supply to the fridge from the starter battery ( it's situated next to the starter battery). Replaced the fuse and it now works fine.

 

[J&S]

Well done PADDY. when you say at the back of the fridge do you really mean the rear? As my clicking comes from inside the fridge control box at the top of the fridge on the front.
Could be the same relay just mounted in a different place?

 

[paddymcc]

Yes at the rear and accessible through the lower vent. I could do a photo of it tomorrow if you want?

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[J&S]

Oh please that would be most helpful.. thank Paddy your a star!

 

[paddymcc]

Here you are @J&S :
A view through the lower vent, silver gas pipe along the bottom going to the burner on the right. Above it the coolant tube in black with the black cube of the relay behind it. The 12v supply from the starter battery (20A fuse by the battery) is blue and brown coming into the white connecting block directly above the relay. I guess if your supply comes in at the top of the fridge it might be somewhere else although this looks like the standard place? I certainly thought that the noise was coming from the control panel initially but I was incorrect.

 

[Spawn_e_git]

Did this ever get sorted?

Mine appears to have the same issue.

see thread

Dometoc RM7655L Buzzer on 12v

Hi. Fridge model above. When selecting 12v the front panel emits a buzzing sound. To be honest it sounds like a very tired warning buzzer rather than a relay although I have known relays to make strange noises. Only started yesterday . makes the noise when engine running or not. Van is...

www.motorhomefun.co.uk

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[williat1]

Did this ever get sorted?

Mine appears to have the same issue.

see thread

Dometoc RM7655L Buzzer on 12v

Hi. Fridge model above. When selecting 12v the front panel emits a buzzing sound. To be honest it sounds like a very tired warning buzzer rather than a relay although I have known relays to make strange noises. Only started yesterday . makes the noise when engine running or not. Van is...

www.motorhomefun.co.uk

 

[williat1]

Hi

I have the same problem with my Dometic fridge .........rattle from behind control panel temperature control dial. I've had a new control circuit board fitted and fridge out service two months age , All seemed well but rattle has returned with a vengance.
The fridge works fine but the rattle occurs randomly, and is loud enough to wake us up at night.
New relay fitted behind fridge and all electrical connections are tight.

Any ideas?