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Please can anybody help. I have a Swift Sundance with a Carver water heater. The system was emptied by the previous owner. I ahve filled the fresh water tank but have 2 problems,

1) I can't seem to pirme the system as the pump runs continuously when switched on. There is water coming out of the taps as expected.

but also

2) water constantly pours out of the Water heater. I thought it was the w/heater drain plug but this is done up. (The water seems to be coming out of the vent). I would assume that if the heater was full, then the flow to it would cut off.

Any advice on how to prime the system and to stop the water heater 'overflowing' would be much appreciated.

thanks for looking 

I had a similar experience with a Carver 2 it apears the manufacturers knew of a fault with the plastic elbows the pipework connect to, they become brittle and split, this flooded my van. They never recalled the product.

Is the black O ring on the drain plug these should be renewed every coupple of years they are cheap and most caravan assy shops stock them.

The only way is really to take the heater out sliding it out the side of the van its not a hard job, if it wasnt drained it could have frozen and split, i hope it hasnt there not cheap.

Pete