Fault finding and diagnosis
63
Greenstar 8000 Life – 6720883865 (2019/02)
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
Igniter on for too long after flame detected:
1. Check cabling.
2. Check igniter.
3. Check burner module.
2924 V
No feedback from the modulating gas valve Gas valve relay defect.
1. Press Reset button and apply burner start. Wait to see if fault reoccurs.
2. Replace the gas valve.
2925 V
Too low feedback from the modulating gas
valve
Too low feedback from the modulating/current controlled gas valve.
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
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.
2965 B
Flow temperature too high
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.
2966 B
Flow temperature rise in heat exchanger too
rapid
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.
2967 B
Flow/heat exchanger temperature sensor
differential too great
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.
Fault
code
Fault
category
Fault text on the display, description
Remedy