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Fault finding and diagnosis
Fault text on the display, description
2927 B
Flame failed during burner operation
2946 V
Incorrect code plug detected
2948 B
No flame signal with low output
2950 B
No flame signal following starting procedure The burner starts automatically after cleaning.
2963 B
Signal from flow and heat exchanger
temperature sensor outside the permissible
range
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
2970 B
Pressure drop in heating system too rapid
2971 B
System pressure too low
Table 28 Indicators and fault displays
10.1.3 Faults that are not displayed
Appliance faults
Combustion noises too loud; rumbling noises
Flow noises
66
Remedy
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.
Replace the code plug.
The burner starts automatically after cleaning.
1. If the fault occurs repeatedly: check the settings of the CO2 values.
1. Set the correct gas/air ratio correctly.
Connect the connecting lead correctly.
1. Supply sensor is not assembled on the supply pipe.
2. Supply sensor does not make proper contact to the supply pipe.
3. System is not filled with water.
4. No water flow, because CH system is closed.
5. No water flow, because pump is not operating correctly.
1. System is not filled with water.
2. No water flow, because CH system is closed.
3. No water flow, because pump is not operating correctly.
1. System is not filled with water.
2. No water flow, because CH system is closed.
3. No water flow, because pump is not operating correctly.
1. Supply sensor is not assembled on the supply pipe.
2. Supply sensor does not make proper contact to the supply pipe.
3. System is not filled with water.
4. No water flow, because CH system is closed.
5. No water flow, because pump is not operating correctly.
–
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.
Remedy
▶ 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.
▶ Set the pump rate or pump characteristic map correctly and match to the maximum
output.
Greenstar 8000 Life – 6720883858 (2019/02)
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