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Glow worm betacom 30 c boiler error code 70 flashing?

Error code 70 flashing, boiler not lit, no hot water. replaced air pressure switch as that what the manual says the error code 70 means and nothing has changed. boiler still not working. Anyone have any idea what else it could be please. I've had no heating or water since last
friday.
Nic C, May 2013