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no hot water and pressure valve is on red and water is leakiing outside?

I have installed a baxi combi 105e; serial MBKo451 compno 2478726/00.

My combi boiler is playing up. For months the hot water light is off and I am not able to get hot water except when I switch to boiler and central heating. I also noted a week ago that the pressure valve/indicator was low, so I turned the pressure valve on, it went straight into the red zone and has not levelled back to the normal pressure. A week ago the boiler started to leak wate outside. WHATS WRONG!!
Jeanie, November 2011
Diaframe in water section of diverter valve may have been faulty so no hotwater when tap is opened so need replacing

k, November 2011
drain water from the radiator using a bleed valve when COLD until the pressure is around 1 bar.then retry

A1, November 2011