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FlowMax · Combi boiler

07 Flue test (chimney sweeper) function active

Menu / mode display FlowMax condensing combi (FLOWMAX-120)

What the display is showing

Code 07 shows while the flue test function is on. It runs the unit at maximum heating output with no modulation for 15 minutes, which is useful for taking combustion readings. Nothing is wrong.

Applies to: FLOWMAX-120 condensing combi

What to do

  1. Hold the Service button for 7 seconds to start the function.
  2. Take the combustion readings within the 15 minutes.
  3. Press the unit OFF button to stop it early.

Settings for these units

Other codes on the same units

  • 08 Frost protection 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.67-68. 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.