Worcester Greenstar 2000 Installation And Maintenance Instructions Manual page 83

Description
2964 B Flow rate in heat exchanger too low
2965 B Flow temperature too high
2966 B Flow temperature rise in heat exchanger too
rapid
2967 B Flow/heat exchanger temperature sensor
differential too great
2972 – Mains voltage too low
2973 – System fault boiler electronics / basic
controller
2974 – Internal fault
3071 – Comfort + II RF
Table 36 Indicators and fault displays
Greenstar 2000 – 6 721 820 552 (2021/02)
Remedy
▶ 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.
▶ 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 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.
▶ 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.
Check the mains voltage on the appliance (L and N).
▶ Perform factory reset.
▶ Check and replace control unit.
▶ Restart the appliance and check if fault remains.
▶ Check and replace control unit.
▶ 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 finding and diagnosis
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