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how can I fix the boiler which is stuck on full blast?

The display is flashing FC and we cant alter the setting the boiler is on at the moment - cant lower the temp and its on full blast 24/7 and not following its prog or responding to the room control
jeff, February 2012
not a lot to go on with this question. Will help to know the type of boiler and as many details as you can come up with.

geoff shuttle, February 2012