What does error code F9 mean on my Viessmann B2TF Boiler?
If your Viessmann Boiler displays error code F9, it means the fan speed is too low during the burner start. To address this, check the fan, the fan connecting cables and power supply, and the fan control. Then, press the reset button R.
What to do if Viessmann B2TF Boiler shows error code FA?
If your Viessmann Boiler displays error code FA, it indicates that the fan is not at a standstill. To resolve this, check the fan, fan connecting cables, and fan control. Then, press reset button R.
How do I fix a Viessmann B2TF Boiler displaying error code FC?
If your Viessmann Boiler displays error code FC, it indicates a gas train fault, faulty modulation valve control, or a blocked flue gas path. To resolve this, check the gas train and the flue gas system. Then, press reset button R.
What does error code FE mean on a Viessmann Boiler?
If your Viessmann Boiler displays error code FE, it indicates that the boiler coding card or main PCB is faulty. To attempt a fix, press reset button R. If the fault persists, replace the boiler coding card or control unit.
What causes error code E9 on a Viessmann B2TF?
Error code E9 on a Viessmann Boiler indicates that the ionisation current lies outside the permissible range during calibration. To resolve this, check the ionisation electrode and cable, check the flue gas system for tightness, and press reset button R.
What does error code EA mean on my Viessmann B2TF?
If your Viessmann Boiler displays error code EA, it indicates that the ionisation current lies outside the permissible range during calibration. To resolve this, check the ionisation electrode and cable, and then press reset button R.
What does error code EC mean on my Viessmann B2TF?
If your Viessmann Boiler displays error code EC, it indicates that the ionisation current lies outside the permissible range during calibration. To resolve this, check the ionisation electrode and cable, then press reset button R.
Why does my Viessmann B2TF Boiler show error code Eb?
If your Viessmann Boiler shows error code Eb, it indicates that heat draw-off is repeatedly too low during calibration. Initiate a heat draw-off. Switch the boiler OFF and ON again. Press reset button R. Set coding address 12:1. This special function leads to heat being transferred to the heating circuit during calibration.
What should I do if my Viessmann B2TF displays error code FF?
If your Viessmann Boiler displays error code FF, it indicates an internal fault or that the reset button R is blocked. Try starting the equipment again. If it will not restart, replace the control unit.
What does error code F8 indicate on a Viessmann B2TF Boiler?
If your Viessmann Boiler displays error code F8, it indicates that the gas valve closes too late. To resolve this, check the gas train and both control paths. Then, press reset button R.
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