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 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 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 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 fix fault 10 on Viessmann B0KA Boiler?
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 30 mean on Viessmann Boiler?
If your Viessmann Boiler shows fault code 30, caused by a short circuit or lead break in the boiler water temperature sensor, you should check the boiler water temperature sensor.
What to do if Viessmann B0KA shows fault 51?
If your Viessmann Boiler shows fault code 51, caused by a short circuit or lead break in the outlet temperature sensor, you should check the sensor.
What causes fault code F4 on a Viessmann Boiler?
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.
What causes fault A9 on Viessmann B0KA?
If your Viessmann Boiler displays fault code A9, which indicates a communication error with the OpenTherm device, you should check the connections and lead. If required, replace the OpenTherm device.
What does fault b0 mean on a Viessmann Boiler?
If your Viessmann Boiler displays fault code b0, indicating a short circuit in the flue gas temperature sensor, you should check the sensor.
General| Model | B0KA |
|---|---|
| Category | Boiler |
| Modulation | Up to 1:6 |
| Fuel Type | Natural Gas |
| Efficiency | Up to 98% AFUE |
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