Worcester GR2300iW C Installation And Maintenance Instructions

Fault finding and diagnosis
83
Greenstar 2000 – 6 721 820 552 (2021/02)
Table 36 Indicators and fault displays
2964 B Flow rate in heat exchanger too low ▶ Check the flow through the appliance and that the system is filled.
▶ Check for air locks in the system and purge if required.
▶ Check the heat exchanger sensor (primary thermistor) and the plug connected to the
temperature sensor.
▶ Check the resistance of the temperature sensor and replace if required.
▶ Check the continuity of the harness and replace if required.
2965 B Flow temperature too high ▶ Check the flow through the appliance and the system is filled.
▶ Check for the air locks in the system and purge if required.
▶ Check the isolation valves.
2966 B Flow temperature rise in heat exchanger too
rapid
▶ Check the flow through the appliance and the system is filled.
▶ Check for the air locks in the system and purge if required.
▶ Check the isolation valves.
▶ Check the pump is operating freely and check the voltage to the pump.
2967 B Flow/heat exchanger temperature sensor
differential too great
▶ Check the flow through the appliance and the system is filled.
▶ Check for air locks in the system and purge if required.
▶ Check the isolation valves.
▶ Check the pump is operating freely and check the voltage to the pump.
▶ Check the heat exchanger sensor and the flow sensor are making contact with the
pipework.
▶ Check the heat exchanger sensor and the resistance of the temperature sensor and
replace if required.
▶ Check the continuity of harness and replace if required.
2972 – Mains voltage too low Check the mains voltage on the appliance (L and N).
2973 – System fault boiler electronics / basic
controller
▶ Perform factory reset.
▶ Check and replace control unit.
2974 – Internal fault ▶ Restart the appliance and check if fault remains.
▶ Check and replace control unit.
3071 – Comfort + II RF ▶ Check the configuration (address setting). The selected setting requires a remote
control.
▶ Check the EMS connection cable for the remote control for damage. The BUS voltage on
the remote control must be between 12 and 15 V DC.
▶ The remote control is defective.
Fault code Fault category
Description Remedy

Worcester GR2300iW C Specifications

General

Brand	Worcester
Model	GR2300iW C
Category	Boiler
Language	English