10.1.3 Faults That Are Not Displayed - Worcester Greenstar 8000 Life Installation And Maintenance Instructions Manual

10.1.3 Faults that are not displayed

Appliance faults
Combustion noises too loud; rumbling noises
Flow noises
Heat-up takes too long.
Flue gas values incorrect; CO content too high.
Violent ignition, poor ignition.
Condensate in air box
Combi boilers: hot water outlet temperature is not
reached.
Combi boilers: DHW volume is not reached.
No function, the display remains dark.
Table 31 Faults that are not shown on the display
System gassing
WARNING
If you suspect the heating system is gassing, you must exercise
caution when carrying out testing or remedial work as the gasses
produced can be flammable.
Do not vent air from radiators whilst the central heating is switched
on. Allow 30mins after venting the radiators before using the
central heating or hot water.
▶ Whilst venting radiators, do not allow the pressure on the boiler to
drop below the point at which it is normally set.
▶ If the system is to be drained, the boiler must be electrically isolated.
Greenstar 8000 Life – 6720883865 (2021/11)
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.
▶ Set the pump rate or pump characteristic map correctly and match to the maximum
output.
▶ 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.
▶ 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.
▶ For natural gas: check the external gas flow monitor, replace if required.
▶ Check the burner, replace if required.
▶ Check the air/gas ratio control valve; replace if required.
▶ Check the non-return valve in the air-gas manifold, replace if required.
▶ Check the turbine, replace if required.
▶ Check the gas/air ratio.
▶ Check the plate heat exchanger.
▶ Check the electrical wiring for damage.
▶ Replace defective cables.
▶ Check the fuse, replace if required.
CAUTION
If system pressure is repeatedly increasing, even when the
appliance is not operating, you should first check that the filling link
is fully closed and confirm that it is not passing. If radiators are also
not heating to the top of the panels and repeatedly need venting, the
heating system may be suffering from gassing. This is an indication
that corrosion is taking place and requires the system being cleaned
and treated to BS7593:2019.
▶ This should be confirmed by taking water samples to check pH levels
and turbidity.
▶ Failure to properly maintain the heating system may result in damage
to the system and appliance, and may affect the boiler warranty.
Fault finding and diagnosis
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