Worcester GR4700iW C Installation And Maintenance Instructions

Fault finding and diagnosis
Greenstar 4000 – 6 720 891 161 (2020/09)
72
233 V Boiler identification module or device
electronics faulty
▶ Wrong code plug is inserted.
▶ Check the code plug is not damaged.
▶ Replace the code plug if required.
234 V Gas valve electrical fault ▶ Check the gas supply to the property and the inlet on the gas valve (check drop on
inlet).
▶ Check the connections on the gas valve and the board (loose connection).
▶ Check the continuity down harness and replace if required.
▶ Check the voltage to the gas valve (19‒24 V DC approx. when demand).
▶ Check for water on the gas valve connections.
▶ Check the resistance on the gas valve (pins 1‒2 approx. 69.5 Ohms).
▶ Replace the gas valve if resistances are incorrect.
▶ If all tests are correct: replace the PCB.
235 V Conflicting versions of boiler electr. and
boiler identification
▶ Replace the code plug or the burner control.
237 V System fault ▶ Check the code plug is not damaged.
▶ Replace the code plug if required.
▶ Replace the control unit (PCB).
238 V Boiler electronics faulty ▶ Check the gas supply to the property and the inlet on the gas valve (check drop on
inlet).
▶ Check the connections on the gas valve and the board (loose connection).
▶ Check the continuity down harness and replace if required.
▶ Check the voltage to the gas valve (19‒24 V DC approx. when demand).
▶ Check for water on the gas valve connections.
▶ Check the resistance on the gas valve (pins 1‒2 approx. 69.5 Ohms).
▶ If all tests are correct: replace the PCB.
242 V Boiler electr. system fault ▶ Reset appliance electronics (factory reset).
▶ Check the electrical connections on the board (check for loose wires etc.).
▶ Replace the control unit.
245 V System fault boiler electronics / basic
controller
▶ Reset appliance electronics (factory reset).
▶ Check the electrical connections on the board (check for loose wires etc.).
▶ Replace the control unit.
249 V System fault boiler electronics / basic
controller
▶ Reset appliance electronics (factory reset).
▶ Check the electrical connections on the board (check for loose wires etc.).
▶ Replace the control unit.
250 V System fault boiler electronics / basic
controller
▶ Reset appliance electronics (factory reset).
▶ Check the electrical connections on the board (check for loose wires etc.).
▶ Replace the control unit.
251 V System fault boiler electronics / basic
controller
▶ Reset appliance electronics (factory reset).
▶ Check the electrical connections on the board (check for loose wires etc.).
▶ Replace the control unit.
252 V System fault boiler electronics / basic
controller
▶ Reset appliance electronics (factory reset).
▶ Check the electrical connections on the board (check for loose wires etc.).
▶ Replace the control unit.
253 V System fault boiler electronics / basic
controller
▶ Reset appliance electronics (factory reset).
▶ Check the electrical connections on the board (check for loose wires etc.).
▶ Replace the control unit.
254 V System fault boiler electronics / basic
controller
▶ Reset appliance electronics (factory reset).
▶ Check the electrical connections on the board (check for loose wires etc.).
▶ Replace the control unit.
258 V System fault boiler electronics / basic
controller
▶ Reset appliance electronics (factory reset).
▶ Check the electrical connections on the board (check for loose wires etc.).
▶ Replace the control unit.
259 V System fault boiler electronics / basic
controller
▶ Reset appliance electronics (factory reset).
▶ Check the electrical connections on the board (check for loose wires etc.).
▶ Replace the control unit.
Fault code Fault category
Fault text on the display, description Remedy

Worcester GR4700iW C Specifications

General

Brand	Worcester
Model	GR4700iW C
Category	Boiler
Language	English