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Mend Saunier Duval Boiler Pressure System

loosing pressure from my saunier combi and water from the expansion pipe?

the combi works fine when the heating is on but when running the tape water the pressure begins to rise slowly. when i turn the heating off after a while the pressure drops and water seems to come out of the expansion pipe. i then have to build the pressure to turn the heating back on. please can some tell me whats wrong

help
November 2007
Saunier DuvalHeating, Home Heating SystemsBoiler Pressure System
the boiler is a saunier F30

help
November 2007
it shounds like the pressure releif valve is letting by,
what make and model is your boiler ?

barry
November 2007
it can go up to 1.7-9 when the water is running. by expansion pipe i do mean the one going from the boiler to the outside. Thanks

help
November 2007
how high does the pressure go,
by expansion pipe do you mean the 15 mm pipe on the outside
wall where the boiler is hung.

barry
November 2007

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Saunier Duval Combi Losing Pressure - Help!