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Mend Boiler Pressure Drops After

boiler pressure drops to nil after use!!!?

i can use the hot water all day long and pressure stays same... i put central heating on and it works perfect, pressure rises slightly which i believe is normal but when i turn heating off the pressure drops to nil within half hour and i have to put pressure back into it to make it work... what does this mean?
I know i will need to get someone out but would like a rough idea of why its doing it and how much its going to cost?

christine
October 2012
Look for leak if OK see no water drip from pressure valve if OK than pressure vessel need pump up to .75 bar when empty or refer to boiler manual

ltd
October 2012

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