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potterton combi 80 boiler heating comes on and off ?

potterton combi 80 boiler heating comes on and off / pump runs when hot tap is turned on ( its recently had the PCB Modulation board replaced ) has anybody got any idea`s
Mark, October 2008
There does not seem to be many heating engineer`s on this site

Mark, October 2008
Hi no dripping tap but the pump runs when hot tap is put on the pump does run the central heating but you can here a bit of water noises and a couple of rads don`t get warm when the boiler stays on for a short time ive been told diverter valve ? or pump ?

Mark, October 2008
Have you got a dripping hot tap which is enough to affect the heating
Could try turning of main stop cock off just in case to prove

a, October 2008
link Click here to see other fixes for Potterton.