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This valve appears to be the source of the noise and clearly linked to when the dhw is on. Thank you

Yes. Seems like it has gone a bit better but it is linked to the pin being in wether pushed by the motor or manually. Since I have been looking more into it, it also looks like dhw is slow to get going when the heating is on. May be irrelevant though.

The motor appears to behave as expected. Pin still sticky-sh and rattling persist, albeit reduced, in the valve area when pin in dhw mode.

Took a look again and here are the symptoms. When the motor is out and the pin out, heating works fine nice and quietly. Pushing the pin in, the rattling starts and the water temperature rises fast. Pushing in and out seems to have unstuck the pin but still feels sticky. There does not...

Will take a look tonight. Thanks to both for your quick pointers.

Many thanks. You cover W2?

Indeed, it did seem to come from the diverter valve motor and pump area. Any suggestions? Or just replacement. May not be relevant, but water pressure needs to be topped up weekly without any leaks.

Inherited a Vokera Linea 24 with the house. Except for the periodic rattling noises things were working fine until two days ago when the rattling noise became permanent and the heating stopped being activated. Hot water appears to be working fine and gas fire kicks in with demand but no central...