hello all. Help need with Worcester 9.24

[sullydog]

I'm just a "jack of all " handyman that is always willing to ask experts when i dont know the answers.

Today i want to be a plumber!

I have a Worcester 9.24 Electronic RSF-E

it has usually been pretty reliable....however

when on CH and HW the rads heat brill, hot water worked but only just
when on HW only i dont get any hot water at all.

i have replaced the diverter valve

the hot waetr is now brill when selected with CH
but still cold if HW only is selected.

i've tested the front panel switches...ok
ive tested the micro switches on top of the diverter valve...ok


someone out there must have seen this before? Can you help please?

 

[Dotty]

Afraid this isn't a DIY repair.

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