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Sime Super 90 does not ignite?

I have just replaced the diverter valve, and mircoswitch on my boiler. (No leaks) Microswitch wireing as per the manual. For at least 12 hours no pilot light.
Now the pilot light is on, but still no main burner. No hot water no C H.
Any advice Please. Thank You Jimmy
Jimmy Murphy, November 2009
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