Bosch · Tankless water heater

Open Taps Open Taps message during auto adjust

Normal status Bosch Greentherm T9800 SEBosch Greentherm T9900 SE

What the display is showing

During the automatic gas and air adjustment (UC Auto Adjust) the display shows Open Taps when more water flow is needed. Open more hot water taps (a tub and two sinks are usually enough) and let the process continue. It starts about 5 minutes into the adjustment and a green check mark shows when it finishes.

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

FC Touch key held over 20 seconds
FH FH failure history
HS HS about
OD OD operation data
PA PA water actuator (valve calibration)
PE PE appliance type (read-only data)
SA SA settings menu
Setpoint display Set temperature shown on touch display

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Source: Bosch Greentherm T9800 SE 160-199 installation 6720816815 (06.2023), 8.11.1 Automatic Gas and Air adjustment p.60-61; 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.