Carver cascade 2 doing my head in

Feb 16, 2013
15,675
30,427
uttoxeter
Funster No
24,713
MH
ambulance conversion
Exp
50 years
as most of you know I am converting an ambulance to a motorhome by useing the inside of an old caravan, well just about finished now but the water heater just won't play right, if the engine is running it works without fault , same if on hook up , but just on battery it comes up with the low voltage light and won't work , but this is a new batteryand always shows well over 12 volts , I have rung the expert in Nottingham that always comes up on searchs but he doesn't understand it , is there something somewhere that reads the voltage or what, it's not supposed to cut out till it drops to 10.5volts but it's nowhere near that low.
What can I trynext?
 

two

Aug 4, 2011
4,404
3,441
West Midlands
Funster No
17,624
MH
A-Class Fiat
Test the voltage at the Cascade end. If it's low (I expect so) put thicker supply wires in.
The voltage at the battery will be higher when on the move or on EHU, so will compensate for the loss down thin wires.
 

TheBig1

LIFE MEMBER
Nov 27, 2011
15,195
30,455
Dorset
Funster No
19,048
MH
A class
Exp
many many years! since I was a kid
as water heaters go, the cascade is pretty simple and reliable. to work properly it needs to be supplied a full 12v direct from the battery via a fuse using good thick cables

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OP
chaser
Feb 16, 2013
15,675
30,427
uttoxeter
Funster No
24,713
MH
ambulance conversion
Exp
50 years
as water heaters go, the cascade is pretty simple and reliable. to work properly it needs to be supplied a full 12v direct from the battery via a fuse using good thick cables
Afraid that's what it's got:( only about two foot direct from battery poles and it's a new battery that always shows well over 12 volts at both ends.
 
OP
chaser
Feb 16, 2013
15,675
30,427
uttoxeter
Funster No
24,713
MH
ambulance conversion
Exp
50 years
as water heaters go, the cascade is pretty simple and reliable. to work properly it needs to be supplied a full 12v direct from the battery via a fuse using good thick cables
On hook up or if the engine is running it works non stop , switching on and off automatic but just leave it to battery and it stops(n)
 

TheBig1

LIFE MEMBER
Nov 27, 2011
15,195
30,455
Dorset
Funster No
19,048
MH
A class
Exp
many many years! since I was a kid
engine running and on hookup will supply 13.8v may be a duff controller

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OP
chaser
Feb 16, 2013
15,675
30,427
uttoxeter
Funster No
24,713
MH
ambulance conversion
Exp
50 years
engine running and on hookup will supply 13.8v may be a duff controller
That's what I'm thinking but where is it? There's a printed circuit in the switch on the wall and also another one under the burner, I don't want to mess with things that has nothing to do with it so do you know where the senser will be?
Don't want to be a pain on this but it's a mystery to me.
 

Allanm

Free Member
Jun 30, 2013
5,436
9,177
Cotes d'armor, France
Funster No
26,730
MH
Burstner Harmony TI 736 G
Exp
Since 1987
Could be either the burner control module or the switch, more likely the module ( these are the only components). It’s easy to remove and if AR electronics are only a few miles away, it might be good to let them have a look at it. I think a pcb repair and retest, where they set everything up and make sure it’s working properly) is about £60.
I assume you have it wired correctly? 12v supply to switch then the 4 way cable from the switch to the burner?
The burner and control module are all one unit. To get it out, you take off the outer plastic cowling, (4 screws), take off a metal plate covering the burner ( 2 screws) and there are 2 screws holding the burner unit in place. Undo these and the module will slide out. Disconnect the wiring from the burner and your done.
Don’t forget to turn the gas off first!
 

Kris777

Free Member
Aug 24, 2020
6
2
Funster No
74,923
MH
a class
Exp
Since 2015
Hello, I have exactly the same situation and water heater won't start when running from leisure battery. The current voltage is 12.6v when on battery. When on hook up goes up to 13.9v and water heater is operating normally. Please help. Chaser have you solved your issue?
Thanks,kris

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TheBig1

LIFE MEMBER
Nov 27, 2011
15,195
30,455
Dorset
Funster No
19,048
MH
A class
Exp
many many years! since I was a kid

two

Aug 4, 2011
4,404
3,441
West Midlands
Funster No
17,624
MH
A-Class Fiat
Hello, I have exactly the same situation and water heater won't start when running from leisure battery. The current voltage is 12.6v when on battery. When on hook up goes up to 13.9v and water heater is operating normally. Please help. Chaser have you solved your issue?
Thanks,kris
Have you selected electric heating only?
 

Kris777

Free Member
Aug 24, 2020
6
2
Funster No
74,923
MH
a class
Exp
Since 2015

Kris777

Free Member
Aug 24, 2020
6
2
Funster No
74,923
MH
a class
Exp
Since 2015

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Kris777

Free Member
Aug 24, 2020
6
2
Funster No
74,923
MH
a class
Exp
Since 2015
Hi, just installed and all seems to be ok and igniter is working above 12.62v. Thanks again:)
 
OP
chaser
Feb 16, 2013
15,675
30,427
uttoxeter
Funster No
24,713
MH
ambulance conversion
Exp
50 years
chaser? Can you help?
Sorry not been on much this week, been a bit busy, and only just seen this but yes I did go to http://www.arelectronics.co.uk
And they are really the bees knees on these things, and what it was , was the cable from switch to module, can't think what they are called but it is the same sort of ends that you connect things on computers, but should be stronger cable than the one I had, it has to be the proper one for the boiler not the computer ones , just thought what they are called, din plugs, yeah been perfect ever since.

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Feb 26, 2012
474
327
Funster No
19,975
MH
coach
Exp
Motorhome since 2006 (caravanning 38yrs)
I will have to try to remember this just in case ours throws a wobbly.
 
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