heating works fine but boiler doesnt even try to fire with hot tap on and i can see the pin on the diverter moving so i dont think its the diverter valve

chris, July 2012

hi the cx has a flow sensor its not operated by the diverter vavle its most likely the hot water flow sensors is faulty. thats the first thing i would look at replacing u can download the installation manual online it will show u the part and fault finding hope this helps have installed plenty of cx in my days. ps dont buy 1 again go for vaillant or Worcester alot more reliable

kash, July 2012

if divertor valve moves on DHW demand then that seems to prove DHW flow turbine working ok
the only thing left is the PCB
try switching off electrical power to boiler for a minimum of 5 minutes then switch power back on

AWOL, July 2012