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what does f9 fault sign on glow worm c30i mean?

f9 flasing on the boiler panel
bola, August 2009
Hi try the presure sensor,isolate flow and return,drain boiler and remove presure sensor and check the small hole in botton of sensor is not blockedalso chech small hole in housing it sits in is not blocked,refit in reverse order

andy, August 2009