Bosch Tankless Water Heater: Read the last 10 error codes (FH failure history)
Read the last 10 error codes (FH failure history) on a Bosch tankless water heater: FH shows the last 10 error codes; three dots mean no error has occurred. The date symbol shows when an error happened.
Applies to: Greentherm T9800 SE 160/199 and T9900 SE 160/199 tankless water heaters
How to fix read the last 10 error codes (fh failure history): step by step
- Open P4 Information, select FH Failure History
- Touch up or down to move between stored errors
- Touch the date symbol to see the date and hour of an error
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), 6.5 Information / Adjustments menu pp.47-48; 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.