Fault finding and diagnosis
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Greenstar 4000 – 6 720 891 161 (2020/09)
10.1.3 Faults that are not displayed
Table 32 Faults that are not shown on the display
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 gas 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, repair or replace if required.
▶ Check the gas/air ratio.
▶ Check the gas valve; replace if required.
Delayed ignition, poor ignition. ▶ Check the ignition transformer function for misfiring in the Function check menu
Ignition test, 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.
▶ For natural gas: check the external gas flow monitor, replace if required.
▶ Check the burner, replace if required.
▶ Check the gas valve; replace if required.
Condensate in air box ▶ Check the non-return valve in the burner hood assembly, replace if required.
Combi boilers: hot water outlet temperature is not
reached.
▶ Check the turbine, replace if required.
▶ Check the gas/air ratio.
▶ Check for reversed pipework or cross leaking mixing units such as showers.
Combi boilers: DHW volume is not reached. ▶ Check the plate heat exchanger.
No function, the display remains dark. ▶ Check the electrical wiring for damage.
▶ Replace defective cables.
▶ Check the fuse, replace if required. One spare fuse is supplied.
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