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

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