Carver cascade 2 blowing fuses

barry1506

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Hi I need some help with my motorhome hot water it keeps blowing a fuse when powered on.
I have removed the element and relay but im not sure how to test on ohms the element reads 64 ohms not sure if that's the problem or the relay.

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A guess, but 64-odd ohms cold sounds like the sort of value I'd expect to find. About 800 watts or so at 230v.
Did you test the resistance between live and neutral of the cables?
Did you test the resistances of the relay?
 
The element in your photo was a mains element, so I foolishly assumed it was a mains fuse that is blowing.

I am not sure what the relay is for, but if it is intended to run off the mains wiring, it won't do anything on a 9v dc supply.

I don't recall there being a mains relay in the Carver Cascade I had, though.

If it is a 12v fuse that's the problem, the mains element and its resistance aren't relevant.

If I recall correctly, there was a control switch with an on button and an off button, which I think was for the gas. I'm not convinced it didnt't just work as a simple switch.

The electric side was indeed a simple on/off switch. This was over 25 years ago, so I may be misremembering.

My recollection was that the cascade was a really clever design let down by the abysmal quality of aluminium casting and pressed steel components.

Bits corroded really badly and had to be fettled regularly.

Bits round the burner section was prone to dissolve into reddish-brown dust, but if you cleared thst away, it still worked.

The main hot water tank was a sheet steel drum wrapped in expanded polystyrene insulation with the uninsulated aluminium end caps sealed by rubbery sealing strips.

If you had hard water in rhe tank, scale used to get under the seals and cause leaks, adding to the corrosion.

If yours was still working, that's quite an achievement.
 
assuming this is a mains element, 64 ohms would suggest it is an 800W element and should be operational. That rating which is pretty typical for one of those? (my Truma Ultrastore is an 800W element).
 
Sorry mate.
It's had a long life. Junk it.

You might be able to find one from a caravan breaker or O' Learies of Beverly.
 
As above read between pin and earth (case)
The relay doesn't belong with the heater it's a homemade alteration...as standard it is fed directly from a switched fused outlet.
If the element is deceased it's a second hand one tend to be £30/40 on eBay..Great effective heaters simple to repair and most parts still readily available( the 240 element being one of the few bit not available new) still make around £200 for a complete one on eBay.I have one in the van faultless for 3 yrs now.( got 3 complete working ones in the loft for spares..doubt me or the van will live long enough to need them all)
 
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