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Fault on Potterton Prima F80 boiler?

My Potterton Prima F80 boiler repeats often many cycles of trying to fire up before actually doing so. Any ideas on what might be causing this?
Stuart Orme, September 2010
split air tubes at top of boiler pull off cut 25 mm of replace should do the trick

steve bh heating, September 2010
link Click here to see other fixes for Potterton Prima.