The boiler has started losing a lot of water & needs topping up at least once a week.
I have been advised by a plumber that there must a leak somewhere in the pipework under the floorboards.Is it at all possible the boiler could be at fault ?.
Check expansion vessel (flat) .empty boiler. With a foot pump repressurise expansion vessel, refill boiler. Make sure no water drips from the pressure relief valve. Sorted.
Oops., June 2013
have check pressure relief valve pipe going out from boiler any sign of water ,if change valve,if not look out for rads and pipes
