central heating?

potterton performa 30HE
GCN 47-393-13
CH OK
NO DHW
NO FAULT CODES/LIGHTS
look in installation manual
page 7
item 31
does DHW mode light illuminate when DHW tap opened?
if YES we are looking at PCB fault or DHW temperature sensor
if NO we are looking at DHW flow switch on 3 way valve assembly or DHW microswitch

manwithnoname
May 2012