10.1.3 Faults That Are Not Displayed; Environmental Protection And Disposal - Bosch Worcester Greenstar 8000 Series Installation And Maintenance Instructions Manual

Fault text on the display, description
2970 B Pressure drop in heating system too rapid
2971 B System pressure too low
Table 24 Indicators and fault displays

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 25 Faults that are not shown on the display
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Environmental protection and disposal

Environmental protection is a fundamental corporate strategy of the
Bosch Group.
The quality of our products, their economy and environmental safety are
all of equal importance to us and all environmental protection legislation
and regulations are strictly observed.
We use the best possible technology and materials for protecting the
environment taking account of economic considerations.
Packaging
Where packaging is concerned, we participate in country-specific
recycling processes that ensure optimum recycling.
All of our packaging materials are environmentally compatible and can be
recycled.
Greenstar 8000 Style – 6720883855 (2019/01)
Remedy
–
1. Vent the heating system.
2. Top up water until the preset pressure is reached.
3. Replace the cable to the pressure sensor.
4. Replace the pressure sensor.
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 mixing appliance, 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.
Used appliances
Used appliances contain valuable materials that can be recycled.
The various assemblies can be easily dismantled. Synthetic materials are
marked accordingly. Assemblies can therefore be sorted by composition
and passed on for recycling or disposal.
Used electrical and electronic appliances
Environmental protection and disposal
Electrical or electronic devices that are no longer
serviceable must be collected separately and sent for
environmentally compatible recycling (in accordance with
the European Waste Electrical and Electronic Equipment
Directive).
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