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Worcester Bosch boiler fault codes

Full list of Worcester Bosch boiler fault codes with meanings, common causes and safe first steps.

EA 227Ignition failure, no flame detected E9 224Overheating (safety limit tripped)A1 281Pump fault C6 215Fan fault D1 240Temperature sensor (thermistor) fault E2 222Temperature sensor (thermistor) fault F7 228False flame detected FA 306False flame detected FD 231Power supply interrupted 1017Water pressure too low