hot water but no heating

[markjack]

i have a baxi bermuda central heating system
i have now got a problem with no heating but the hot water is ok, pump is working and boiler is firing when hot water is turned on but not when heating is turned on i've tried bypassing the room thermostat but still no joy any ideas could it be the motorised valve(honeywell) your help would be greatly appreciated

 

[breezer]

are you saying that when you by pass your romm stat the boiler does not start?

 

[boydycx]

I have a similar problem with mine, but my upstairs radiators work if the room thermostat upstairs is activated but not downstairs.
If i change the setting on the motorised valve it will heat upstairs and downstairs together but gets too much for the system and the pressure risers.
I also bypassed the thermostat to no avail.

 

[breezer]

i am not a plumber or heating engineer

it sounds like your motorised valve is on itws way to the big boiler in the sky