Changed pressure relief valve on my vaillant turbo max plus 824e,(pressure kept dropping)
Now pressure now creeps up, set at 1.0 rises up to 2.0p+.More so when running the heating.
Any ideas ?? please
Pressure vessel need pumping has no air,drain out boiler,shut inlet valves outlet valves,drain out from PRV,using cycle pump pump to .75 use gauge ,vessel right in front as open boiler cover
