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VAILLANT 837E PRESSURE LOSS?

HI,I HAVE TO KEEP OPEN THE WATER VALVUE TO TOP UP WATER PRESSURE GAUGE,
A.J, January 2010
pressure loss means you have a leak, look for water around the boiler, radiators and aroung relief pipe outside below the flue / exhaust.

Ian, January 2010
link Click here to see other fixes for Vaillant.