Fault finding and diagnosis
85
Greenstar 2000 – 6 721 820 552 (2021/02)
11.4
Faults that are not displayed
Table 38 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 ratio control valve; replace if required.
▶ Check condense drain is clear.
▶ Check fan depression.
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.
▶ Check system is balanced.
▶ Check anti-cycle time.
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 ratio control valve; replace if required.
Delayed ignition, poor ignition.
▶ Check the ignition transformer function for misfiring in
Menu 6
, replace if required.
▶ Check the gas type.
▶ Check the gas supply pressure.
▶ Check operation of meter governor.
▶ Check the power supply.
▶ Check the electrodes; 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 hot water.
▶ Check the turbine, replace if required.
▶ Check diverter valve
▶ Check for cross-piping.
DHW volume is not reached.
▶ Check the plate heat exchanger.
▶ Check flow device.
▶ Check silencer body.
No function, the display remains dark.
▶ Check the electrical wiring for damage.
▶ Replace defective cables.
▶ Check the fuse, replace if required.
