Worcester Greenstar Highflow 550CDi LPG Boiler Fault Codes

Code	Description	Check, repair/replace as necessary
A5	Tank NTC defect	check tank NTC and leads
A7	DHW NTC defect	check hot water NTC and connecting lead
A8	EMS coms error	check electrical connections.
b1	Code plug not detected	Insert code plug correctly.
b2,b3,b4, b5,b6	Data error	software/pcb error
b7	Burner control error	software/pcb error
C6	Fan defect	check fan, lead and connector.
D3	External Temp limiter	check external stat.
D5	Condensate overflow	check condensate pump and leads.
D6	Internal heatbank overheated	check tank overheat thermostat
EA	Burner control lockout	check gas supply and igniter electrode.
E2	Primary NTC defect	check CH NTC and lead.
E9	OH stat tripped	check system pressure and pump.
F0	Internal error	check electrical connector contacts.
F1	Rom check error	software/pcb error.
F7	Flame detected after appliance shut off	check electrode assembly, dry pcb.
FA	Flame detected after gas shut off	check gas valve and leads
Fd	Reset button pressed	press reset button again.