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boiler ignites intermittantly?

the saunier duval sd623 combi boiler ignites sometimes when tap is turned on, it can fire up several times in a row and when it doesn;t light up if you turn the Max/Min dial back and forth a couple of times it fires up. what is the problem?
Mr Nugent, September 2007
WATER VALVE DIAPHRAGM

Bendan, September 2008
link Click here to see other fixes for Saunier Duval SD623.