Bosch Tankless Water Heater: Calibrate the water valves (PA water actuator)
Calibrate the water valves (PA water actuator) on a Bosch tankless water heater: Needed after replacing the main or bypass valve or the electronic control unit; takes several minutes and needs hot water flowing (bypass calibration needs 0.80 to 1.80 gpm).
Applies to: Greentherm T9800 SE 160/199 and T9900 SE 160/199 tankless water heaters
How to fix calibrate the water valves (pa water actuator): step by step
- Enter AU Technical Settings, then open PA
- Select MF main valve or BP bypass valve and touch OK
- Open a hot water tap and do not interfere until completion shows
If the unit shows an error code, look it up: Bosch Tankless Water Heater codes
Models
Bosch Greentherm T9800 SE
Greentherm T9800 SE 160Greentherm T9800 SE 199Greentherm T9800 SEC 199
Bosch Greentherm T9900 SE
Greentherm T9900 i 199Greentherm T9900 SE 160Greentherm T9900 SE 199
Source: Bosch Greentherm T9800 SE 160-199 installation 6720816815 (06.2023), 6.7 Water valves calibration p.53; T9900 SE 160-199 installation 6 720 813 635 (2024-06) same section. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.