saunier Duval is over pressurising when the heating is on. ?

Thanks Kash

The expansion vessel has had it, but many thanks

Andrew
December 2012

hi most likely the expansion vessel needs refilling. its a red thing inside the boiler normally located at the back its a metal capsule with a balloon in it when the water heats up it expands the water in the heating this then causes the balloon to shrink to accommodate the expansion of the water. anyway to fill it u will need to drain the boiler or the heating to 0 bar pressure then on the red tank normally at the top of the tank is a tyre pressure valve as the same as the one you have on your car. get a foot pump and inflate it between 1 - 1.5 bar and it should do the trick. ps if it keeps happening you vessel has had it

kash
November 2012