What the manual says
Manufacturer manualDisplayed if the flue gas temperature sensor is not positioned correctly; also displayed if the flue gas temperature sensor is correctly positioned but the burner faults persist, e.g. caused by air in the gas line
From this model's manual
Verified against the Viessmann/Viessmann Vitodens 200 W B2hh B2kh 6219526 installation & service manual.
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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Related fault codes
All 12 fault codes on the Vitodens 200-W B2HH-19
Seeing a different code? Every code this model can display, in one place.