Worcester Greenstar 2000 Installation And Maintenance Instructions Manual page 76

Fault finding and diagnosis
Description
247 – System fault boiler electronics / basic
controller
249 V Internal software error
250 V Default software error
251 V Flash test error
252 V Stack overflow
253 V RAM test error
254 V Eeprom test error
256 V System fault boiler electronics / basic
controller
257 – System fault boiler electronics / basic
controller
258 V Internal watchdog error
259 V AD reference error
262 V Internal OS error
76
Remedy
▶ Reset burner control - factory reset.
▶ Check electrical connections of burner control.
▶ Replace burner control.
▶ Restart the appliance to see if the problem re-occurs.
▶ Check the electrical connections on the board (check for loose wires etc.).
▶ Check the code plug, if present, is not damaged.
▶ Replace the code plug, if present and required.
▶ Replace the control unit (PCB).
▶ Restart the appliance to see if problem re-occurs.
▶ Check the electrical connections on the board (check for loose wires etc.).
▶ Check the code plug, if present, is not damaged.
▶ Replace the code plug, if present and required.
▶ Replace the control unit (PCB).
▶ Restart the appliance to see if the problem re-occurs.
▶ Check the electrical connections on the board (check for loose wires etc.).
▶ Check the code plug, if present, is not damaged.
▶ Replace the code plug, if present and required.
▶ Replace the control unit (PCB).
▶ Restart the appliance to see if the problem re-occurs.
▶ Check the electrical connections on the board (check for loose wires etc.).
▶ Check the code plug, if present, is not damaged.
▶ Replace the code plug, if present and required.
▶ Replace the control unit (PCB).
▶ Restart the appliance to see if the problem re-occurs.
▶ Check the electrical connections on the board (check for loose wires etc.).
▶ Check the code plug, if present, is not damaged.
▶ Replace the code plug, if present and required.
▶ Replace the control unit (PCB).
▶ Restart the appliance to see if the problem re-occurs.
▶ Check the electrical connections on the board (check for loose wires etc.).
▶ Check the code plug, if present, is not damaged.
▶ Replace the code plug, if present and required.
▶ Replace the control unit (PCB).
▶ Reset control unit / burner control unit - factory reset.
▶ Reconnect electrical connections at control unit correctly.
▶ Replace the control unit/burner control unit.
▶ Reset burner control - factory reset.
▶ Check electrical connections of burner control.
▶ Replace burner control.
▶ Restart the appliance to see if the problem re-occurs.
▶ Check the electrical connections on the board (check for loose wires etc.).
▶ Check the code plug, if present, is not damaged.
▶ Replace the code plug, if present and required.
▶ Replace the control unit (PCB).
▶ Restart the appliance to see if the problem re-occurs.
▶ Check the electrical connections on the board (check for loose wires etc.).
▶ Check the code plug, if present, is not damaged.
▶ Replace the code plug, if present and required.
▶ Replace the control unit (PCB).
▶ Restart the appliance to see if the problem re-occurs.
▶ Check the electrical connections on board (check for loose wires etc.).
▶ Check the code plug, if present, is not damaged.
▶ Replace the code plug, if present and required.
▶ Replace the control unit (PCB).
Greenstar 2000 – 6 721 820 552 (2021/02)