Bosch · Tankless water heater

Setpoint display Set temperature shown on touch display

Normal status Bosch Greentherm T9800 SEBosch Greentherm T9900 SE

What the display is showing

In normal operation the touch display shows the selected hot water set temperature. The temperature shown is a device reading, so feel the water by hand before it is used for children or elderly people.

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

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

HS HS about
OD OD operation data
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
Solar mode Solar mode indicator
UC UC auto adjust (gas and air)

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Source: Bosch Greentherm T9800 SE 160-199 installation 6720816815 (06.2023), 6.2 Power and 6.4 Temperature selection pp.45-46; 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.