Worcester bosch boiler problems Fan on but not igniting

This Worcester BOsch Greenstar System boiler fan was not coming on while its getting power. Also there was good signs indicating that the boiler service is overdue, such as over heating- leaking burner seal causing corrosion on the side ( due to condensate ) and melt down of the internal insulation of the combustion cover. This boiler was serviced and a new fan was fitted, you can see the video of the repaired boiler working on the following link:
• Worcester bosch boiler...
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[@danielhill9334]

Oh wow what a great helpful video! If your telepathic

[@yensabi]

Corroded electrode , replace with updated part without sight glass......!
Also looks like it's never been serviced.....
Maybe do a fan speed test.....

[@jkphj5869]

Gas valve ...provided you have OL then 35 v at the gas valve intermittently