Biasi boiler firing sequence interrupted each 2 seconds

Joined
17 Dec 2009
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Bedfordshire
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United Kingdom
Seasonal greetings.
Problem: Biasi Riva 24s. Boiler wants to fire. Firing sequence interrupted every 2 seconds. sometimes it will fire, sometimes not. Issue begins each time the system calls for heat. Same story with both dhw and ch.

I suspect Air pressure switch, but I am not a boilerman. Also small leak at the actuator on diverter, especially when the diverter valve diverts dhw when ch is running. I can't tell if the leak is worsening since I've just discovered it. I mention it because I now identify the leak as a possibility for my problem.

I am a retired commercial/ industrial plumber-fitter I know very little about domestic boilers. My funds are in short supply and I don' want to waste cash on a wrong boiler part. Please advise. This is my own boiler and I need heating for the holiday. Thanks
 
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