Cascade 2 water heater

Dec 28, 2022
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Greetings from Estonia
Sorry my bad English
I have a problem with the Gas part of the Cascade 2 water boiler. 220V works fine
In the summer, the wall switch burned out. I bought a new one, put it on and it started burning again.
Then I disassembled the burner itself. I cleaned the burner and visually inspected the electrical part and everything seemed fine. I put everything back together and tried a new switch and it started working. A few months passed and the error happened again. And the wall switch burned out on the same spot. (I attach a photo)
It started when I got 220v electricity from a bad place. (I got electricity from the aluminum frame of the caravan door)
Now what could be causing this boiler mess?
Has anyone had this happen?
 

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Mar 14, 2005
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Hello Vstuning,

Welcome to the forum.

I'm sorry to see you are having a problem with your caravan , and your water heater.

Firstly the water heater should not be causing you to have electric shocks at the caravan door. That fact you are getting shocks is a safety issue, and unless you understand the the way caravan electrics should be installed its a job for a
professional to sort out.

The gas control side of the Carver Cascade is all run from the 12V supply, The tell tale sign of damage in the gas heaters control switch and the same damaged to a second switch unit suggests there is a problem with the way the heater has been wired into the caravan, but how such a big current could reach the switch unit is a mystery.

The types of problems you have are very unusual and I think its unlikely any one on the forum will be able to identify the actual fault, so I strongly suggest you get the caravan checked by a professional caravana repairer.
 
Jul 18, 2017
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You have a short somewhere in the circuit and from your description it appears to be intermittent. Visually you will not see the "short" and need a electrician to check the circuit as the short is probably after the circuit board that you have replaced. You have been very lucky that a fire has not started so the help of a professional is required to check the wiring.
 
Mar 14, 2005
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Well the burnt track on the circuit board is the earth track, so as water heater is attached through the caravans metal skin, the track has simply acted as a fuse and blown so offering some protection to wiring beyond
 
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Mar 14, 2005
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On the assumption that Gary from ArcSystems is correct (and I have seen this type of problem previously) then its unlikely the water heater is the cause of the problem, it will be a wiring problem else where in the caravan, and which every appliance of fitting that is faulty has tried to use the Cascade as its route to ground or 0V.

In the UK all 230Vac appliances must either be double insulated with no exposed metal being able to make contact to live or neutral, or must have a hard wired earth connection to the earth on the incoming supply It must not rely on the exposed metalic surfaces to make the earth connection.

And for 12V systems again the 0Vdc return must also be hard wired and must not rely on the metal work of the caravan to make the 0V connection.
 
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Mar 14, 2005
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Hi John, HNY, I'm sure you'll remember the original Cascade switch had a 1amp negative as well as positive fuse, simply to protect it's earth circuit from outside causes of overload, not itself
 
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