i can not have just my hot water on when i turn my dial to just hot water my heating comes on, also if i turn my tempreture dial down on heating my hot water does not come through.but hot water and rads do work fine when heating dial on full but my rads and water seem very hot and my water temp dial does not seem to work when i turn it down.

MARK BUTTERY, April 2009

sounds like the divertor valve diaphram

pete, April 2009

Sound like it could be a nimber of things,
Diverter Valve,
PCB
or Diaphragm

You should contact a local Gas Safe Register approved engineer, who holds a CEN1 Competency certificate
IT IS ILLEGAL TO WORK ON GAS APPLIANCES UNLESS YOU ARE REGISTERED WITH GAS SAFE< AND HOLD RELAVENT CERTIFICATES OF COMPETENCE

Ricko, April 2009

check diverter valve operation

STE, April 2009