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problem with potterton prima f ?

when we turn the heating off the boiler will not fire up for hot water. Turn the heating back on and the water comes on.
Lizzie, July 2009
Hi. 2x2 valves

Lizzie, July 2009
how many motorised valves have you 1 x 3 port or 2 x 2 ports ?

hi-spec plumbing & heating (essex), July 2009
link Click here to see other fixes for Potterton Prima F.