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pierceplumber
I have a problem with Vokera Compact 25he combi boiler. I'm registered gas engineer. When I came there first time I noticed that the boiler can't start because of air pressure switch. I checked that and it is ok. Replaced fan, cleaned vonturi then, so the boiler started ok on hot water and central heating. Worked 2 days and now sometimes stops again and needs reset to go. What could it be? Thanks for help