Baxi combi 80e dhw issue

[Hobo128]

Called out to this boiler last night....
No hot water... Heating fine...
Run the hot tap, boiler does not fire.... Pin on diverter does not operate.... if I manually press micro switch boiler fires.... I am going to replace the diaphragm in the diverter valve tomorrow... However! I have tried this before and still no joy.... In fact I have done this twice and it's not worked... what am I missing if it decides to not work

 

[Knappers]

I would replace whole diverter

 

[ShaunCorbs]

There’s a pin in the back of the front diverter housing normally requires a rebuilding you can get a rebuild kit online

 

[Aquarius]

Check the sensing pipes? Check the push rod.