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C1 is flashing on my Greenstar HE combi boiler?

And it won't start up. What does this mean?
If I reset it says 22 in display then as soon as it gets to 23 it starts flashing C1?
Please help.
Louise, July 2012
fan speed too low

AWOL, July 2012
link Click here to see other fixes for Worcester Bosch Greenstar HE.