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All the mechanical properties appear to be functioning g correctly. The Pressure differential vslve operates as ut should. I've tested the sir pressure switch by blowing / sucking the tubes connected and will fire the boiler after a restart if operated like this. In my mind I have doubts...

Thanks for your replies...it's not a combi. Hot water cylinder. How obvious is the pump proving switch to find and ceck? Thank you.

Hi, I'm looking for guidance with regards to the above boiler, please. The boiler Vsillant vc gb 242e has recently stopped working in that the fan and pump would run but no flame would establish. I've checked the diff press switch, pump and air pressure switch, all in good order good boiler...