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Bosch · Tankless water heater

OD OD operation data

Menu / mode display Bosch Greentherm T9800 SEBosch Greentherm T9900 SE

What the display is showing

Live readings for troubleshooting: heat exchanger outlet NTC, inlet NTC, outlet NTC, air (box) pressure, fan speed, water flow, ambient NTC, exhaust gas NTC, SS heat exchanger NTC, external tank temperature, barometric pressure and ionization value.

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

What to do

  1. Open P4 Information and select OD Operation Data
  2. Touch the symbols to scroll through the readings

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

  • FA Gas leak in the gas path
  • FC Touch key held over 20 seconds
  • FH FH failure history
  • HS HS about
  • Open Taps Open Taps message during auto adjust
  • PA PA water actuator (valve calibration)
  • PE PE appliance type (read-only data)
  • SA SA settings menu

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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.