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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
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