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How can I fix low water pressure on Saunier Duval sd30e?

The low water pressure light is flashing and the boiler wont ignite. Have drained the system down and refilled up to 1.5 bar but still flashing. Is there anything else to check please.
A D'Arcy, September 2009
You were exactly right, it was stuck. Now got hot water. Great. Tks

A D'Arcy, September 2009
low water pressure switch is prob stuck or broken.

Ian, September 2009
link Click here to see other fixes for Saunier Duval.