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Gas-Fired Condensing Boilers: Greenstar FS/Combi FS Inspection and Maintenance

This general maintenance procedure also serves as an inspection form. Maintenance is required for a long service life of the appliance, for effficient and economical operation, and to keep the environmental impact as low as possible.
MaintainX
10/24/2021

Gas-Fired Condensing Boilers: Greenstar FS/Combi FS Inspection and Maintenance

This general maintenance procedure also serves as an inspection form. Maintenance is required for a long service life of the appliance, for effficient and economical operation, and to keep the environmental impact as low as possible.

    Annual service and maintenance is required for a long service life of the appliance, for efficient and economical operation, and to keep the environmental impact as low as possible. Owners/operators are encouraged to sign a service and maintenance contract with a trained and certified installer for annual servicing and maintenance of the boiler.

    DANGER: Explosion!

    DANGER: Risk of flue gas poisoning.

    DANGER: Risk of electric shock!

    NOTICE: Insufficient antifreeze can accelerate corrosion.

    Heat exchanger block inspection and cleaning

    NOTICE: Damage to the coating of the heat exchanger.

    Heatronic boiler control

    In case of a component defect, a fault is shown on the display. The Heatronic boiler control monitors all safety and control components.

    NOTICE: The Heatronic boiler control can be damaged by leaking water.

    The following analytical tools are needed for service and maintenance:

    After the inspection/maintenance:

    Description of various steps

    Calling up the latest fault (service function 6.A)

    Fresh water filter (only combi boiler ZWB..-3A)

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    Plate type heat exchanger (only combi boiler ZWB..-3A)

    If the DHW output on the combi boiler is significantly reduced:

    To remove the plate type heat exchanger:

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    • Screenshot2021-02-20at10.31.58AM.png
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    ▶ Remove the plate type heat exchanger.

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    Checking the electrodes

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    • Screenshot2021-02-20at11.02.02AM.png

    Burner servicing

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    Heat exchanger block inspection and cleaning

    NOTICE: Damage to the coating of the heat exchanger.

    If mechanical cleaning is required:

    For cleaning the heat exchanger, use Bosch main heat exchanger gaskets, the heat exchanger brush and the heat exchanger cleaning blade which are available as spare parts.

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    ▶ Clean the condensate tray (with reversed brush).

    • Screenshot2021-02-20at11.09.34AM.png

    Condensate trap cleaning

    ▶ Remove condensate trap (steps 1 and 2) and check heat exchanger orifice for clear passage.

    • Screenshot2021-02-20at11.10.35AM.png

    Checking the mixer diaphragm

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