Viessmann Boiler Error Codes

A plain-English reference to 17 common Viessmann fault codes — what each means, what causes it, and when to call a licensed BC gas technician.

Viessmann Vitodens boilers display "F" fault codes on the Vitotronic control when a safety circuit trips. German engineering is famously reliable, but when a Vitodens does fault, the code narrows the cause quickly. This reference explains the common Viessmann fault codes — and why flame, fan, gas and venting faults call for a licensed, factory-trained BC technician rather than a reset.

Smell gas? Leave the building immediately and call 911 or FortisBC at 1-800-663-9911 from outside. Never bypass a safety lockout or attempt gas work yourself — in BC it must be done by a licensed gas fitter.

Control-board (PCB) fault

Viessmann F2Burner Control / Safety Chain Open

Ignition fault

Viessmann F4No Flame Signal on Ignition Viessmann F28Ignition Failure

Air-pressure / venting fault

Viessmann F5Air-Pressure / Fan Fault

Combustion-fan fault

Viessmann F9Fan Speed Too Low Viessmann FAFan Does Not Stop

Temperature-sensor fault

Viessmann F10Boiler (Outlet) Sensor Short Circuit Viessmann F11DHW Sensor Fault Viessmann F12Flue-Gas Sensor Fault Viessmann F30Temperature Sensor Short Circuit Viessmann F31Temperature Sensor Open Circuit Viessmann F36Sensor / Component Fault

Over-temperature / high-limit

Viessmann F20Overheating / High-Limit Trip

Water-flow / circulation fault

Viessmann F22Dry-Fire / Pump / Lack of Water Viessmann F23Lack of Water / Circulation Fault

Flame failure

Viessmann F29Flame Loss During Operation

Fault code

Viessmann FFGeneral Fault — Restart Required

Viessmann error codes — FAQ

Why is my Viessmann boiler showing an error code?

Viessmann boilers display a fault code when a safety circuit detects a problem — for example with ignition, flame, water flow, temperature or venting. The code points to the affected system. The boiler shuts down to protect itself; a licensed technician then diagnoses the true root cause before repair.

Can I just reset my Viessmann boiler?

A single reset after a one-off event is usually fine, but repeated resets without fixing the cause can be unsafe — especially for ignition, gas and venting faults — and can cause further damage. If the code returns, switch the boiler off and call GasBoilers.ca at 604-359-1081.

Do you repair all Viessmann boiler models in Greater Vancouver?

Yes. Our Red Seal–certified, gas-licensed technicians service Viessmann Vitodens 100-W, 200-W and 222-F series across Vancouver, Burnaby, Surrey, Richmond, the Tri-Cities and the rest of Greater Vancouver. Same-day appointments are often available.

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