Fridge alarm on 12v help please! (1 Viewer)

[jimiol]

My dometic fridge works on gas and ehu but when I turn it to 12v when on the move and the engine running the green light comes on to indicate it is working but there is a very audible buzzing noise/alarm.
Trouble shooting in the manuel states if it is not working on 12v change 16a fuse. But it does appear to be working just with an alarm. Has anyone encountered this before and what is the fix? I haven't got any 16 a fuses on me but I'll get one today. Also I'm guessing the fuse is on my main fuse board in the Hab area rather than one in the fridge, am I guessing correctly?
Crossing from Ireland now and will be spending a couple of days in burnham on sea Somerset before catching the Portsmouth to Bilbao crossing on Wednesday. Anyone know someone near burnham on sea with dometic fridge expertise?

 

[mike mcglynn]

Hi Jimiol ,make sure your step is in properly as on mine the relay for fridge and step is the same ,so same supply and step alarm may be the issue .

 

[Larby]

My thoughts as well. Try turning fridge off then start vehicle, if buzzing is still there, then step.

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[jimiol]

Hi Jimiol ,make sure your step is in properly as on mine the relay for fridge and step is the same ,so same supply and step alarm may be the issue .

Thanks guys I don't have a step. Nor did it ever have one my vans not that posh.

 

[Larby]

My thoughts as well. Try turning fridge off then start vehicle, if buzzing is still there, then step.

OK, no step, still try with fridge off to either eliminate or confirm it's the fridge.

 

[jimiol]

OK, no step, still try with fridge off to either eliminate or confirm it's the fridge.

Thanks there is no alarm sound other than when the engine is running AND the fridge switched to 12v.
I have plenty of charge in my 2 leisure and one cab batteries.

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[Lenny HB]

If would help if you let us know make & model.
We had the alarm going off randomly on our Dometic 8505, turned out to be the door open alarm, the spring steel strip that operates the micro switch had gone a bit flat. A quick re-bend sorted it out, it is in the same housing as the LED light.

If it is only on 12v it could be the contacts on the relay that feeds the fridge are carboned up giving high resistance and the alarm is for low volts.