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FlowMax · Combi boiler

08 Frost protection active

Normal status FlowMax condensing combi (FLOWMAX-120)

What the display is showing

Code 08 means the frost protection function is running. Heating circuit: starts when the heating sensor reads 5 C, fires at minimum gas pressure with the 3-way valve in the winter position, and ends when the sensor reaches 30 C. Hot water storage models: starts when the storage sensor reads 4 C, heats the DHW circuit at minimum gas pressure with the valve in the summer position, and ends at 8 C. This is normal in cold conditions.

Applies to: FLOWMAX-120 condensing combi

Settings for these units

Other codes on the same units

  • 07 Flue test (chimney sweeper) function active
  • 22 Fan frequency readout (parameter 22)
  • 28 Legionella prevention cycle active
  • Curve number Compensation curve number display
  • OFF Switched off, frost protection still active
  • PL 0 Parameter menu entered

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Source: FLOWMAX-120 Instruction Manual, 6.11 Diagnostics - Function codes, p.68. Summarized in our own words; check the original manual for your model.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.