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Bosch · Tankless water heater

FH FH failure history

Menu / mode display Bosch Greentherm T9800 SEBosch Greentherm T9900 SE

What the display is showing

Shows the last 10 error codes. Three dots (an ellipsis) mean no error has occurred. Touching the date symbol shows when an error happened.

Applies to: Greentherm T9800 SE 160/199 and T9900 SE 160/199 tankless water heaters

What to do

  1. Open P4 Information, select FH Failure History
  2. Touch up or down to move between the stored errors
  3. Touch the date symbol to see the date and hour of an error

Models that show this code

6 models in Bosch Greentherm T9800 SE, Bosch Greentherm T9900 SE

Greentherm T9800 SE 160Greentherm T9800 SE 199Greentherm T9800 SEC 199Greentherm T9900 SE 160Greentherm T9900 SE 199Greentherm T9900 i 199

Other codes on the same units

  • EF Wrong gas type configured
  • Error reset Hold ON/OFF key to clear an error code
  • FA Gas leak in the gas path
  • FC Touch key held over 20 seconds
  • HS HS about
  • OD OD operation data
  • Open Taps Open Taps message during auto adjust
  • PA PA water actuator (valve calibration)

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Source: Bosch Greentherm T9800 SE 160-199 installation 6720816815 (06.2023), 6.5 Information / Adjustments menu pp.47-48; T9900 SE 160-199 installation 6 720 813 635 (2024-06) same section. 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.