Dometic 3 way fridge issue (1 Viewer)

Dec 30, 2019
363
280
Manchester, UK
Funster No
67,710
MH
Burstner t700
Exp
Early 2019
Fridge works fine on gas and 240v.
When I turn switch to batt position Red light comes on.
Checked fridge fuse on E box all ok is there another low voltage fuse anywhere, looked behind grill outside can't see one, any ideas

Cheers
 
Feb 21, 2016
4,929
30,123
Uk
Funster No
41,726
MH
C class
Exp
Since 2017
The Dometic fridge is designed to work on 12v when the engine is running. You don’t state whether it is or isn’t . If it doesn’t work when the engine is running,it’s almost certainly a fuse.
 
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OP
OP
TONCAZ
Dec 30, 2019
363
280
Manchester, UK
Funster No
67,710
MH
Burstner t700
Exp
Early 2019
The Dometic fridge is designed to work on 12v when the engine is running. You don’t state whether it is or isn’t . If it doesn’t work when the engine is running,it’s almost certainly a fuse.
Sorry parked and running still the same
 
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Tombola

LIFE MEMBER
Nov 21, 2020
4,953
16,069
Merseyside
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78,053
MH
Rapido 8094DF
Exp
Since 2004
Take the cover off the outside and check with a meter that the element is getting power when engine is running.
If not then poss relay or fuse problem backwards from there, or if it is then knackered 12v element even.
 
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Jan 2, 2015
2,478
8,651
Cumbria
Funster No
34,615
MH
Burstner Solano t725
Exp
since 2014
We had the same symptoms on our Fiat based Burstner Solano t725 after we had a duff starter battery replaced at a Norauto depot in Spain.

After much head scratching, I discovered that the 20amp fuse attached to a lead connecting to the positive terminal of the new starter battery was missing and I found it down the side of the battery box.

I replaced the fuse and fridge started working again on 12V when engine was running.

Good Luck.

IMG_20180328_190248.jpg

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Feb 19, 2020
1,454
1,610
North Ayrshire
Funster No
68,864
MH
Adria Matrix 670SC
Exp
Newbie
I have a Thetforde 3 way fridge which had the same problem. Not sure how similar the Dometic is. There is a 20 amp fuse on the fridge PCB. I started at the plug behind the bottom fridge vent. There are 2 x12v feeds. One low current to operate the fridge (if fridge panel and lights are working this is ok) and one high current to provide 12V power when the engine is running (thicker red and white wires) and one signal wire ( D+) that comes from the alternator when the engine is running. This wire only has 12v positive when the engine is running. All these voltages checked out OK but the fridge still gave error code 6 which is 12v supply outwith limits of 10v -15.5 v. I removed the PCB cover ( one single torx screw) There's a 20 amp fuse that isn't visible until you remove the whole assembly from the mounting. Its held on by 2 bolts either side. Once they are off the pcb unit can be angled down to reveal the back of the pcb. I could see some scorch marks on the rear of the pcb so decided to get to the fuse on the other side. There's 3 screws on the pcb but only one that needs to be removed to release the board. The 12v power feed plugs have to be removed to release the board so that you can see the other side where the fuse is mounted. It was pretty obvious this had blown. I replaced it put it all back together and it's now working fine. I'm a bit sceptical that it might happen again as it takes quite a bit to blow a 20 amp fuse. I'll see how it goes 😀
 

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Upvote 0
OP
OP
TONCAZ
Dec 30, 2019
363
280
Manchester, UK
Funster No
67,710
MH
Burstner t700
Exp
Early 2019
We had the same symptoms on our Fiat based Burstner Solano t725 after we had a duff starter battery replaced at a Norauto depot in Spain.

After much head scratching, I discovered that the 20amp fuse attached to a lead connecting to the positive terminal of the new starter battery was missing and I found it down the side of the battery box.

I replaced the fuse and fridge started working again on 12V when engine was running.

Good Luck.

View attachment 703016
Cheers will make that 1st point of call..
 
Upvote 0
Jun 16, 2020
4
2
Middlesbrough
Funster No
71,853
MH
DethleffsTrend i7057
Exp
Since 2012
I have a Thetforde 3 way fridge which had the same problem. Not sure how similar the Dometic is. There is a 20 amp fuse on the fridge PCB. I started at the plug behind the bottom fridge vent. There are 2 x12v feeds. One low current to operate the fridge (if fridge panel and lights are working this is ok) and one high current to provide 12V power when the engine is running (thicker red and white wires) and one signal wire ( D+) that comes from the alternator when the engine is running. This wire only has 12v positive when the engine is running. All these voltages checked out OK but the fridge still gave error code 6 which is 12v supply outwith limits of 10v -15.5 v. I removed the PCB cover ( one single torx screw) There's a 20 amp fuse that isn't visible until you remove the whole assembly from the mounting. It’s held on by 2 bolts either side. Once they are off the pcb unit can be angled down to reveal the back of the pcb. I could see some scorch marks on the rear of the pcb so decided to get to the fuse on the other side. There's 3 screws on the pcb but only one that needs to be removed to release the board. The 12v power feed plugs have to be removed to release the board so that you can see the other side where the fuse is mounted. It was pretty obvious this had blown. I replaced it put it all back together and it's now working fine. I'm a bit sceptical that it might happen again as it takes quite a bit to blow a 20 amp fuse. I'll see how it goes 😀
Same problem with my Dethleffs. Did you have any repeat of the fault after you changed the fuse?
 
Upvote 0
Feb 19, 2020
1,454
1,610
North Ayrshire
Funster No
68,864
MH
Adria Matrix 670SC
Exp
Newbie
No but I wrote to Thetford asking about an upgraded pcb and despite just being out of warranty they sent me a new one FOC. Great service but maybe they were concerned it would go on fire. They really should have recalled them all if it's such a problem.
Same problem with my Dethleffs. Did you have any repeat of the fault after
 
Upvote 0

Mou and Iryna

Free Member
Jan 28, 2021
154
53
Javea - Spain
Funster No
78,986
MH
Burstner Ixeo 726+
Exp
I am learning fast 😊
Cheers will make that 1st point of call..
Hello there. I have a Dometic fridge which works well on gas and 220v but not on 12v. I have a Burstner 726 on a fiat ducato chassis and engine. Do you think it is the fuse? If so, where is it located?. Thank you
 
Upvote 0
OP
OP
TONCAZ
Dec 30, 2019
363
280
Manchester, UK
Funster No
67,710
MH
Burstner t700
Exp
Early 2019
Hello there. I have a Dometic fridge which works well on gas and 220v but not on 12v. I have a Burstner 726 on a fiat ducato chassis and engine. Do you think it is the fuse? If so, where is it located?. Thank you
Mine is next to the starter battery between the two front seats (on a Renault master) 20amp yellow
 
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