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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.
How to solve Viessmann B0KA control unit not increasing set value?
To address the issue of the control unit not increasing the set value on your Viessmann Boiler, increase the set value and ensure heat is drawn off.
How to solve control unit issues with no increase set value on Viessmann B0KA?
To address control unit issues with no increase in set value on your Viessmann Boiler, increase the set value and ensure that heat is being drawn off.
Why Viessmann B0KA Boiler has no DHW heating with error code 51?
If your Viessmann Boiler is not heating domestic hot water (DHW) and showing error code 51, it could be due to a short circuit in the outlet temperature sensor. Check the sensor (see page 66).
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 to do if Viessmann Boiler fan doesn't start?
If the fan in your Viessmann Boiler doesn't start after approximately [ ], check the fan, fan connecting cables, fan power supply, and fan control.
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 |
