Worcester Bosch Greenstar 27/30 I system Error Codes

Worcester Bosch Greenstar 27/30 I system Boiler Error Codes

Fault DescriptionSystem Behaviour
T1Ignition test – checking the igniter spark
T2Fan test – checking the basic fan
T3Pump test – checking the basic pump
T4Three way valve test
T6Ionisation oscillator test
9A 362error – incorrect HCM fitted
9U 233Heat Control Module (HCM) error – problem with code plug
B7 257Internal error – possible control board problem
C6 215Fan problem – fan running too fast
C7 214Fan problem – fan not running
D1 240Return sensor error – sensor may be wet or damaged
E2 222Flow sensor short circuit error
E5 218Flow temperature too high
E9 219Safety sensor fault – temperature too high, sensor short circuit or open circuit
EA 227No flame detected or flame signal loss during operation
F0 237Internal error
F7 228Flame error – false flame or flame detected before burner started
FA 306False flame fault – flame detected after burner stop
FD 231Mains power fault – electrical power interruption
FA 364Gas valve EV2 leak test failed – gas valve leak
FB 365Gas valve EV1 leak test failed
A1 281Pump stuck or running with air in the system
C1 264Airflow stopped during operation
C4 273Airflow present during last 24 hour
D1 240Return sensor short circuit
D4 271Temperature difference between flow and safety sensor exceeds limit
E9 224Max thermostat activated – flue gas thermostat overheat
EA 227No ionisation detected after ignition
EF 349Central heating boil detected – boiler operating at minimum burner load with temperature difference greater than 18°C between Flow & Return.
NO CODE 212Safety or flow temperature rising too fast

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