D
dean.
got called out to do a service on 28i, the 1.5 meter vertical flue had a missing clamp to join the two flue lengths, so i got a new one to repair it, now the boiler wont work. the flame lights then locks out after 10 seconds, when i remove my new clamp it works fine. Turns out they got the boiler repaired few months back for constant lock out, so the engineer removed it as a quick fix to let more air flow into boiler.