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sabre he boiler?

Hi hope someone can help with a problem i'm having with my sabre he combi boiler. Yesterdaymorning i noticed the pressue had dropped and red light was on so i adjusted the value thingy to bring pressure back up and when that was done the green light came back on. In the evening i put the heating on and it heated a bit and i went off to bed leaving it on low with thermostat on 17. This morning it was red again but pressure was ok so i turned boiler off and it flashed green again so i thought it was ok.
Then this evening the heating was put on and it heated up a bit then went red again so i turned it off and on again and was fine for about 1 minute then green light stopped flashing and just stayed green and pressure kept rising to well over 2 til i turned it off, please help just had a new baby and at the minute i can't afford an engineer to come and fix it so hope its something that can be done by myself - i'm quite handy at doing some things and will give anything a go. If anyone can help with advice or such would be very grateful, Vicki.
vicki hallett, April 2012
Why pressure drop look for leak ,if no leak even from pressure relief valve ,pressure vessel need pump to .75pls to do that you have to drain system

ltd, April 2012