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richard84Sep 13, 2025
What does fault code 18 mean on Viessmann B0KA?
- LLori WestSep 13, 2025
Fault code 18 on your Viessmann Boiler indicates a lead break in the outside temperature sensor. Check the outside temperature sensor and lead.
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Fault code 18 on your Viessmann Boiler indicates a lead break in the outside temperature sensor. Check the outside temperature sensor and lead.
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.
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 F9 mean on a Viessmann B0KA and how to fix it?
Fault F9 on your Viessmann Boiler indicates that the fan speed is too low during burner start. To resolve this, inspect the fan, fan connecting cables, and power supply. Also, check the fan control. Then, press the "Reset" button.
What does fault E5 mean on a Viessmann Boiler?
If your Viessmann Boiler displays fault code E5, indicating an internal fault, you should check the ionisation electrode and the connecting cables.
What does fault F5 mean on Viessmann B0KA?
If your Viessmann Boiler displays fault code F5, indicating an internal fault, you should check the ignition electrodes and connecting cables.
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.
How to resolve fault 52 on Viessmann Boiler?
If your Viessmann Boiler displays fault code 52, which indicates a short circuit in the flow sensor, you should check the connections and lead. If necessary, replace the sensor.
General| Model | B0KA |
|---|---|
| Category | Boiler |
| Modulation | Up to 1:6 |
| Fuel Type | Natural Gas |
| Efficiency | Up to 98% AFUE |
