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

Servicing a boiler often can keep it from failing when you need it most. Even more so, regular service can keep it running with efficiency. When a boiler is working at its best performance it not only keeps your home and water hot but can save money as well.
MaintainX
08/10/2022

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

Servicing a boiler often can keep it from failing when you need it most. Even more so, regular service can keep it running with efficiency. When a boiler is working at its best performance it not only keeps your home and water hot but can save money as well.

    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)

  • Screenshot2021-02-20at10.29.38AM.png
  • 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:

    Screenshot2021-02-20at10.31.23AM.png
  • Screenshot2021-02-20at10.31.58AM.png
  • Screenshot2021-02-20at10.32.42AM.png
  • Screenshot2021-02-20at10.33.08AM.png
  • ▶ Remove the plate type heat exchanger.

    Screenshot2021-02-20at10.58.10AM.png
  • Checking the electrodes

    Screenshot2021-02-20at11.01.39AM.png
  • Screenshot2021-02-20at11.02.02AM.png
  • Burner servicing

  • Screenshot2021-02-20at11.02.43AM.png
  • Screenshot2021-02-20at11.03.12AM.png
  • 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.

    Screenshot2021-02-20at11.06.25AM.png
  • Screenshot2021-02-20at11.06.57AM.png
  • Screenshot2021-02-20at11.07.24AM.png
  • Screenshot2021-02-20at11.08.35AM.png
  • ▶ 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

    Screenshot2021-02-20at11.47.09AM.png
Source: MaintainX (Community Member)

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