Fault finding and diagnosis
Greenstar 8000 Life – 6720883866 (2019/04)
64
Table 27 Indicators and fault displays
10.1.3 Faults that are not displayed
Table 28 Faults that are not shown on the display
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
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.
Delayed ignition, poor ignition. ▶ Check the ignition transformer with service function t01 for misfiring, replace if
required.
▶ Check the gas type.
▶ Check the gas supply pressure.
▶ Check the power supply.
▶ Check the electrodes with cable; replace if required.
▶ Check the flue system; clean or repair if required.
▶ Check the gas/air ratio.
▶ Check the burner, replace if required.
▶ Check the air/gas ratio control valve; replace if required.
Condensate in air box ▶ Check the non-return valve in the air-gas manifold, replace if required.
No function, the display remains dark. ▶ Check the electrical wiring for damage.
▶ Replace defective cables.
▶ Check the fuse, replace if required.
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