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If your Viessmann Boiler shows fault code 10, and the cause is a short circuit or lead break in the outside temperature sensor, you should check the outside temperature sensor and its lead.
What does fault F8 mean on a Viessmann B0KA Boiler?
If your Viessmann Boiler is displaying fault code F8, which indicates the fuel valve closes too late, you should check the gas train and both control paths.
How to troubleshoot fault F9 on Viessmann B0KA?
If your Viessmann Boiler displays fault code F9, it means the fan speed is too low during burner start. You should check the fan, fan connecting cables, and power supply. Also, check the fan control.
What should I check if my Viessmann Boiler shows fault F4?
If your Viessmann Boiler displays fault code F4, you should check the gas train (ensure the control voltage is 230 V) and verify the gas supply pressure.
How to fix fault F2 on Viessmann B0KA Boiler?
If your Viessmann Boiler is showing fault code F2, which indicates the temperature limiter has responded, you should: 1. Check the heating system fill level. 2. Check the circulation pump. 3. Vent the system. 4. Check the temperature limiter and connecting cables.
What to do if my Viessmann B0KA Boiler shows fault F4?
If your Viessmann Boiler displays fault code F4 and there's no flame signal, you should inspect the ignition/ionisation electrode and its connecting cables. Also, verify the gas pressure, gas train, ignition components, ignition module, and ensure the condensate drain is clear.
General| Model | B0KA |
|---|---|
| Category | Boiler |
| Modulation | Up to 1:6 |
| Fuel Type | Natural Gas |
| Efficiency | Up to 98% AFUE |
