Worcester Bosch 24i, RSF - No CH?

[firebladerrw]

DHW works fine, but no CH.

The CH sequence seems ok - both pump & fan running, but no ignition - ignition works fine for DHW.

Anyone got an idea what this might be? The fault finding schedule doesn't cover DHW working with no CH.

Help would be appreciated.

Thanks

 

[kevplumb]

any external controls

if so check those first

 

[firebladerrw]

any external controls

if so check those first

Sorry, should have said - there are no external controls at all.