Viessmann Error Code 10, 14, F3, and F4 Fault Codes

Natural Gas

All 6 fault codes

Code	Severity	Plain English	DIY
Vitocrossal 300	Medium	Your boiler is struggling to accurately measure the water temperature leaving the system, meaning it may not run efficiently or heat your home correctly.	Engineer
Vitodens 100-W	High	Your boiler has stopped being able to light or maintain a flame, meaning you will likely have no heating or hot water until it is reset or repaired.	Yes
Vitodens 200-W	High	Your boiler has lost communication with a temperature sensor or is detecting a burner issue, meaning it cannot accurately monitor heat levels or stay alight.	Engineer
Vitotronic 050/200-H	Medium	Your boiler's outside temperature sensor is disconnected or faulty, causing the system to think it is freezing when it is not.	Engineer
Vitotronic 200 / 300	Low	Your boiler's outdoor or return temperature sensors are reporting an error, meaning the system is running on a basic backup mode without its usual efficiency settings.	Engineer
Vitotronic 300	High	Your boiler is struggling to accurately measure the temperature outside or inside the unit, causing it to shut down for safety once it gets cold.	Engineer

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