Worcester Greenstar 30 Ri Compact ErP Boiler Fault Codes

Flash Sequence	Type of Fault	Fault	Possible Solutions
Light OFF		No fault	No boiler demand - boiler is OK
Light ON			Heating demand on boiler- boiler is OK
Group 1 Flashing codes
1	Locking	No ionisation detection after ignition	Failure of four ignition attempts, the boiler waits 30 seconds before another attempt is made. Reset the boiler by turning the control knob anticlockwise to the reset position.
2	Locking	Loss of ionisation signal during operation	An established flame has been extinguished. Reset the boiler by turning the control knob anticlockwise to the reset position.
3	Locking	Gas valve error	Gas valve coil disconnected. Check gas valve. Reset the boiler by turning the control knob anticlockwise to the reset position.
4	Locking	First safety timing error/ignition timing error	The flame was not established during the first four seconds of the ignition period. Reset the boiler by turning the control knob anticlockwise to the reset position.
5	Locking	Ionisation detected after burner stopped Gas valve EV2 leak test failed Gas valve EV1 leak test failed Ionisation current detected before burner-start Gas valve error Ionisation sensor shorted	Gas valve leaking. False flame detected. Reset the boiler by turning the control knob anticlockwise to the reset position.

Flash Sequence	Type of Fault	Fault	Possible Solution
Light OFF			No boiler demand - boiler is OK
Light ON			Heating demand on boiler- boiler is OK
Group 2 Flashing codes
6	Locking	Sensor test failed	On power up all safety sensors are checked, the check failed. Reset the boiler by turning the control knob anticlockwise to the reset position.
7	Locking	Safety temperature too high	The main heat exchanger has overheated. Maximum temperature 105°C. Reset the boiler by turning the control knob anticlockwise to the reset position.
8	Blocking	MAX safety thermostat activated	Flue gas thermostat overheat or APS activated
9	Locking	Return temperature too high	Boiler overheat. Reset the boiler by turning the control knob anticlockwise to the reset position.
10	Locking	Flow temperature too high - Supply sensor exceeded 110°C	Primary flow sensor overheated. Reset the boiler by turning the control knob anticlockwise to the reset position.

Flash Sequence	Type of Fault	Fault	Possible Solution
Light OFF			No boiler demand - boiler is OK
Light ON			Heating demand on boiler- boiler is OK
Group 3 Flashing codes
11	Locking	HCM (Heat Control Module) Defective	Incorrect, faulty, or missing HCM. Replace HCM with correct item Reset the boiler by turning the control knob anticlockwise to the reset position.
12	Locking	Fan running too fast Fan running too slow No airflow after defined period of time Fan not running	Defective fan or blocked air way. Reset the boiler by turning the control knob anticlockwise to the reset position.
13	Locking	Mains voltage interrupted after locking error	Reset the boiler by turning the control knob anticlockwise to the reset position.
14	Locking	Internal control board faults	Call Worcester, Bosch Group technical help-line 0330 123 3366
15	Locking	All other faults	Miscellaneous Reset the boiler by turning the control knob anticlockwise to the reset position.