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F30e semia condens boiler wont fire?

When trying to fire up,boiler locks out and code 05 flashes up and continuous flashing of red light.Same when running hot tap.Can anyone please help?
David L, November 2009
F30 E semia condens wont ignite . No error code displays .. Pressure bar reading ok . Makes noise on opening hot water tap but wont ignite no hot water or heating. Please help.

Klogger, March 2017
05 means your boiler is over heating could be lack of circulation, ie pump, faulty stat, or air

barry, November 2009