Bosch Error Code FC: Touch key held over 20 seconds (Tankless)
Bosch error code FC on a tankless water heater means: Touch key held over 20 seconds. It is also called Bosch diagnostic code FC.
Homeowner? What Bosch code FC means for you
Usually minor Your tankless water heater is reporting: Touch key held over 20 seconds. This code is usually informational or minor. The safe checks below often clear it; call us if it keeps showing up.
Safe things you can check yourself
- Check that gas reaches the house: other gas appliances work, or the propane tank is not empty.
- Make sure the heater is plugged in and its breaker is on. In winter, keep the power on: it protects the unit from freezing.
- Outside, make sure the intake and exhaust pipes or vent cap are not blocked by snow, ice, leaves or a nest.
- Check that the hot and cold water valves under the heater are fully open.
- If you have a remote controller, turn it off and on once. If the code comes back, call a technician.
Call (647) 657-2977Book a service call
Licensed technicians serving Vaughan, Toronto and the GTA.
What does Bosch error code FC mean?
A key on the touch display has been pressed continuously for more than 20 seconds.
Applies to: Bosch Greentherm T9800 SE 160/199 and T9900 SE 160/199 / i 199 tankless water heaters
Common causes of Bosch code FC
- Dirty or wet display
- Object resting on the key
Bosch models that use code FC
Greentherm T9800 SE 160Greentherm T9800 SE 199Greentherm T9800 SEC 199Greentherm T9900 i 199Greentherm T9900 SE 160Greentherm T9900 SE 199
Other Bosch Tankless codes
| Code | Meaning |
|---|---|
| F2 | Control unit internal error |
| F3 | Control unit internal error / configuration |
| F7 | Control unit internal error |
| F8 | Control unit internal error |
| F9 | Gas valve driver fault |
| FA | Gas leak in the gas path |
All Bosch Tankless Water Heater error codes →
Bosch code FC: homeowner questions
What does Bosch code FC mean?
Touch key held over 20 seconds. A key on the touch display has been pressed continuously for more than 20 seconds.
Is it safe to keep using my tankless water heater with code FC?
Usually yes. Code FC is normally minor, but if it keeps coming back have it checked.
Can I reset Bosch code FC myself?
You can try one reset (power off for 30 seconds, then on). If Bosch code FC comes back, the cause is still there and a licensed technician should check it.
Who can fix Bosch code FC near me?
Aurora Star Tech Inc. repairs Bosch tankless water heaters in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.
Homeowner help: Tankless Water Heater No Hot Water: What to Check
Troubleshooting guides
- No hot water All brands · Tankless Water Heater
- Water temperature fluctuates All brands · Tankless Water Heater
Source: Bosch Greentherm T9800 SE 160/199 installation 6720816815 (06.2023), Table 24 Error code diagnostics, p.65-69; Bosch Greentherm T9900 SE 160/199 | i 199 installation 6 720 813 635 (2024-06), section 9.1 Error code diagnostics, p.68-73. 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.