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how can i fix my hermann supermicra 30 he boiler?

hermann supermicra 30 he. starts up ok but after about 30 mins burner cuts out and relights itself continuously eg off 8seconds on 8 seconds off 8 seconds on 8 seconds and so on
dave, November 2008
Did anyone sort this problem out as i have the same issue, thanks!

Lee, January 2010
have you fixed this problem, if so what was it as i have the same issue

leigh, January 2009