BoilerFaultCodesWhat the manual says
Manufacturer manualBurner in fault position. Internal fault. Replace the control unit.
From this model's manual
Verified against the Viessmann Vitodens 222 F installation & service manual, page 98.
What causes this fault?
This fault occurs when the boiler's central processor can no longer communicate with the internal components or fails its own start-up safety checks. It is usually caused by an electrical component failure on the main circuit board or a surge that has damaged the delicate microchips that control the heating process.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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