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i have i ravenheat rsf 820 /20 t when the boiler is off it reads 0.5 bar when its on the bar reading shoots up to 3 bar and water comes out of the prv and it will contantly run at 2.8 bar when its on can anybody give me advice on this ?thanks :P

sounds like the exspansion vessel as you said .the other day it was reading 0.5 then i topped the boiler up to 1 bar then after about 15 mins it shot up to 2.9 bar then i had to bleed the radiator till it sat at 2 bar while it was running .it now reads 0.5 when its off then 2 bar when its on is...

cool thanks i will get a plummer out soon as pos

just one more thing when the boiler is off it reads 0.5 bar when its on it reads 2 bar i9s that ok thanks alot for your replys :P

wot do you mean about primary or secondary .sorry .the thermostate on the boiler signals when the water is hot enough then the humming stops and then the flame reduces :P

thanks for the reply as soon as the tap or shower is turned on the boiler fires up to heat the water the humming starts up .then as soon as the water is hot enough in the boiler it stops then it will start again basically it starts every time the boiler has to heat the water up . :P...

i have a ravenheat 820/20t the boiler is fine but just one little thing i bugging me when the hot water tap is running and then the boiler starts up a humming noise .it lasts for about 5 seconds till the water in the boiler is hot again .there is no air in the central heating as i have bled a...