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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
link Click here to see other fixes for Worcester Bosch Greenstar.