Fault finding and diagnosis
Greenstar 8000 Style – 6720883864 (2019/02)
68
Table 24 Indicators and fault displays
10.1.3 Faults that are not displayed
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.Check the integrity 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 code 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
–
2970 B
Pressure drop in heating system too rapid
–
2971 B
System pressure too low
1. Vent the heating system.
2. Top up water until the preset pressure is reached.
3. Replace the cable to the pressure sensor.
4. Replace the pressure sensor.
Fault
code
Fault
category
Fault text on the display, description
Remedy
Appliance faults
Remedy
Combustion noises too loud; rumbling noises
▶ Check the gas type.
▶ Check the gas supply pressure.
▶ Check the flue system; clean or repair if required.
▶ Check the gas/air ratio.
▶ Check the air/gas ratio control valve; replace if required.
Flow noises
▶ Set the pump rate or pump characteristic map correctly and match to the maximum
output.
Heat-up takes too long.
▶ Set the pump rate or pump characteristic map correctly and match to the maximum
output.
Flue gas values incorrect; CO content too high.
▶ Check the gas type.
▶ Check the gas supply pressure.
▶ Check the flue system; clean or repair if required.
▶ Check the gas/air ratio.
▶ Check the air/gas ratio control valve; replace if required.
