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Alpha cb28 boiler. Hot water is fine but central heating isn't working?

Just attempted to start using central heating again after summer and it isn't working. Combi Alpha CB28 boiler and the water is heating absolutely fine, but no central heating- any suggestions??

Isla, September 2007

home Fix label Heating label_important Home Heating Systemsdone

boiler flame keeps turnig off and back on every 1 minuter

bob, September 2010

Hello!
My Boiler has stopped working. no lights or hot water or heating. Its an Alpha CB 28?

Any ideas?

lot, November 2009

Can't answer this and I really need to know how to get the CH working, I've just moved into a flat with this boiler. Hot water's fine but no CH. it's bl**dy freezing, help!!

Dave, December 2007

Hello !
Just check your room thermostat, batteries, exact time , temperature setting high enough ?
Switch the room thermostat on and with the help of a screwdriver listen to the pump if the motor is making the right noise ! sept 17 2007.
Thanks for the feedback when fixed ?
ps: no diverter valve on this model nor diaphragm !

JPh, September 2007

can you advise how to check the diverter valve?
Thanks - Isla

Isla, September 2007

check timer, room stat,diverter valve

kris, September 2007