Fault finding and diagnosis
Greenstar 8000 Style – 6720883855 (2019/01)
68
306 V Flame signal after closing the fuel supply 1. Replace the air/gas ratio control valve.
2. Replace the ionisation cable.
3. Replace the control unit/burner control unit.
815 B Low loss header temp. sensor faulty 1. Check the sensor port.
2. Check the differential sensor for incorrect installation position or breakage.
1017 W Water pressure too low 1. Top up water and vent the system.
2. Replace the pressure sensor.
1022 B Hot water storage temperature sensor is
defective
1. Connect the plug to the hot water temperature sensor correctly.
2. Mount the hot water temperature sensor correctly.
3. Replace the hot water temperature sensor.
4. Replace the connecting lead to the hot water temperature sensor.
1065 B Pressure sensor defective or not connected 1. Connect the plug to the pressure sensor correctly.
2. Replace the connecting lead to the pressure sensor.
3. Replace the pressure sensor.
4. Replace the control unit.
1068 W Outside temperature sensor defective Check the connecting lead.
1075 W Short circuit of the temperature sensor at
the heating block
1. Replace the temperature sensor.
2. Replace the connecting lead to the temperature sensor.
3. Replace the control appliance.
1076 W No signal from the temperature sensor at
the heating block available
1. Replace the temperature sensor.
2. Replace the connecting lead to the temperature sensor.
3. Replace the control unit.
2920 V Fault in flame monitoring –
2927 B Flame failed during burner operation 1. Open the main shut-off valve.
2. Open the appliance shut-off valve.
3. Shut down the appliance and check the gas line.
4. Signal evaluation on printed circuit board defective.
5. Replace the ionisation electrode.
6. Establish protective conductor connection (PE) in the control unit.
7. Replace the ignition cable.
8. Replace the connecting lead to the ionisation electrode.
9. Replace the air/gas ratio control valve.
10.Set the burner correctly.
11.Set the burner at minimum rated load.
12.Convert the flue system.
13.The interconnected room air supply is too small or the size of the ventilation
opening is too small.
14.Clean the heating block on the flue gas side.
15.Replace the control unit/burner control unit.
2946 V Incorrect code plug detected Replace the coding plug.
2948 B No flame signal with low output The burner starts automatically after cleaning.
1. If the fault occurs repeatedly: check the settings of the CO2 values.
2950 B No flame signal following starting procedure The burner starts automatically after cleaning.
1. Set the correct gas/air ratio correctly.
2963 B Signal from flow and heat exchanger
temperature sensor outside the permissible
range
Connect the connecting lead correctly.
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/ heate exchanger temperature sensor
differential too great
–
Fault
code
Fault
category
Fault text on the display, description Remedy
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