BoilerFaultCodesViessmann F0 Fault Code
The Viessmann F0 fault code means: your boiler has stopped working because its internal computer and burner system have detected a technical communication failure.. It appears on 18 Viessmann models in our database.
Technical description: Burner blocked - Internal error
What causes the Viessmann F0 fault?
This fault occurs when the boiler's main control board loses the ability to communicate with the internal burner firing system. It is usually caused by a hardware failure within the electronic control unit (PCB) or a loose connection in the wiring harness that links these critical components. Because the computer cannot safely verify the burner's status, it shuts the system down to prevent an unsafe start-up.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Viessmann models that show the F0 fault code
Click a model for the full fault code list and model-specific repair notes.
- Vitodens 050-W Repair: £450-750
- Vitodens 050-W BPJD 35kW Combi Boiler Repair: £150-350
- Vitodens 100 Compact Repair: £200-500
- Vitodens 100-W B1HA-19
- Vitodens 100-W B1HA-26
- Vitodens 100-W B1HA-30
- Vitodens 100-W B1HA-35
- Vitodens 100-W B1KA-26
- Vitodens 100-W B1KA-30
- Vitodens 100-W B1KA-35
- Vitodens 100-W WB1B Repair: £250-500
- Vitodens 111-W B1LB 26kW Repair: £200-500
- Vitodens 111-W B1LB 35kW Repair: £200-500
- Vitodens 222-F Repair: £450-750
- Vitodens 242-F B2UA Repair: £250-600
- Vitodens 242-F FB2B Repair: £150-350
- Vitodens 300-W Repair: £450-£700
- Vitodens 333-F Repair: £350-700
Source
Viessmann F0 fault code information on this page is sourced and cross-checked against the official Viessmann service / installation manuals for each affected model.
- Viessmann Vitodens 050-W BPJD 35kW Combi Boiler manual (PDF)
- Viessmann Vitodens 100 Compact manual (PDF)
- Viessmann Vitodens 100-W B1KA-35 manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026