water problem (1 Viewer)

[pompeydelboy]

How do I stop the water safety valve from emptying my water tank on my Hymer B544. Just bought this van, its been virtually unused for 5 years . The valve keeps emptying the water tank even though the manual says it does this in low temps to prevent frost damage, it was around 28 degrees here ???

 

[hilldweller]

In the winter we often have to put a clothes peg on the valve to hold it up -- a dangerous bodge but might get you out of trouble 'till you can get it fixed.

 

[Reallyretired]

Check your fuses, the valve requires an applied voltage to keep it closed, so for example a flat battery or turning off the main switch will empty the boiler.

You can cheat by pushing a thin wire into the groove on the stem thus preventing it going down and opening the valve, however it is a safety feature and a boiler that freezes will cost serious money to repair/replace.