Worcester GR4700iW C Installation And Maintenance Instructions

Fault finding and diagnosis
75
Greenstar 4000 – 6 720 891 161 (2020/09)
1071 W Maintenance is now due please call your
service engineer
▶ Check the maintenance menu.
▶ Reset the maintenance code via the reset menu.
1072 W Maintenance is overdue please call your
service engineer
▶ Check the maintenance menu.
▶ Reset the maintenance code via the reset menu.
1073 W Short-circuit at flow temp. sensor ▶ Check the flow temperature sensor plug is connected.
▶ Check the resistance of the flow temperature sensor and replace if required.
▶ Check the continuity of harness and replace if required.
▶ Replace the flow temperature sensor.
1074 W No signal from flow temperature sensor ▶ Check the flow temperature sensor plug is connected.
▶ Check the resistance of the flow temperature sensor and replace if required.
▶ Check the continuity of harness and replace if required.
▶ Replace the flow temperature sensor.
▶ Replace the PCB.
1075 W Heat exchanger temp sensor short circuit ▶ Check the flow temperature sensor plug is connected.
▶ Check the resistance of the flow temperature sensor and replace if required.
▶ Check the continuity of harness and replace if required.
▶ Replace the flow temperature sensor.
▶ Replace the PCB.
1076 W Heat exchanger temp sensor disconnected ▶ Check the flow temperature sensor plug is connected.
▶ Check the resistance of the flow temperature sensor and replace if required.
▶ Check the continuity of harness and replace if required.
▶ Replace the flow temperature sensor.
▶ Replace the PCB.
2085 V Internal fault ▶ Reset the appliance.
▶ Switch off the appliance for 30 seconds and then turn back on.
▶ Check the incoming mains voltage.
▶Check the polarity.
▶ Replace the PCB.
2908 V System fault boiler electronics / basic
controller
▶ Restart the appliance to see if the problem re-occurs.
▶ If the fault remains after resetting: the burner controller (PCB) is defective and must
be replaced.
2910 V Fault in flue system ▶ Check the flue for obstructions and remove any found.
▶ Check the flue integrity test.
▶ Check for water in the sump and check the siphon operation, clean if required.
2914 – Boiler electr. system fault ▶ Restart the appliance to see if the problem re-occurs.
▶ If the fault remains after resetting: the burner controller (PCB) is defective and must
be replaced.
2915 V Boiler electr. system fault The fan keeps running after the post purge.
▶ Reset the appliance.
▶ Create a heat demand to test the boiler's ignition sequence.
▶ Check the voltage to the fan and the continuity of the fan harness.
▶ Check the power modulation on the fan.
▶ PCB may be defective.
2916 V Boiler electr. system fault Gas valve was detected as open during post-purge.
▶ Carry out a gas tightness test on the gas valve and replace if required.
▶ Check the voltage to gas valve.
▶ The gas valve or the PCB may be defective
2920 V Fault in flame monitoring ▶ Check electrodes and connecting leads, replace if required.
▶ Check protective earth conductor connections (PE).
▶ Check appliance electronics, replace control unit if necessary.
2923 V Boiler electr. system fault Unexpected feedback from the modulating/current controlled gas valve.
▶ Check the voltage to the gas valve.
▶ Check the continuity of harness and replace if required.
▶ Check the resistance of the gas valve coils.
▶ The gas valve or the appliance electronics (control unit) may have a fault.
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