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oh and I forgot to say the pressure loss usually happens over night (from 1.2 to 0) or during the course of the day - if I re-fill the boiler before I go to work say 8am, its dropped to 0 by the time i get home at 5/6pm. The water isn't coming out of the prv as I've checked. Do you think it...

thanks for all reploes - Its a Worcester Bosch 240, I think its 5 - 6 years old. The pressure loss started about 3 weeks ago. The plumber came over again this morning with another guy for a second opinion, the other guy is certain it must be a leak but when the plumber isolated the heating...

Please help, I am now at my wits end, I have spent just over £500 on having my boiler 'fixed' over the past 3 weeks and it still doesn't work. The problem is the boiler keeps losing pressure, I have had the pump replaced, the pressure release valve replaced and the expansion vessel replaced and...