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Hi From Roserdog

R

Roserdog

Hi New to this

Got a query - we have a motorhome with Truma combi 4e heater.
The hot water pipe blew off - thinking ot was a pressure relief valve I put a new one on.
Same problem - it blew off

Any ideas?
 
Had this system two vans ago so memory might be wrong. I think the hot water side relies on an air bubble in the hot tank to take up the expansion when it heats up. Suggest you drain the water and refill. If that fails is the pressure switch on the input side working?
 
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