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Ravenheat csi 120 low nox?

I have a Ravenheat Low Nox boiler that has been working fine for 2 years, but last night the central heating fails to fire up. The hot water is working fine. Any ideas what the problem can be?
Amir, May 2008
see you last post for answer

T, May 2008
link Click here to see other fixes for Ravenheat.