Smell gas? Leave the property and call the National Gas Emergency line on 0800 111 999

Viessmann fault code

Viessmann FC: electrical fan control (control unit) faulty

Engineer only

Viessmann describes FC on Vitodens 100-W (B1HC/B1KC) boilers as: electrical fan control (control unit) faulty.

What you can safely do

There is nothing you can safely do yourself with this one. Leave the boiler off and book an engineer.

Find a Gas Safe engineer near you Opens the official Gas Safe Register search.

Applies to: Vitodens 100-W (B1HC/B1KC). Codes can differ between models, so check your manual.

From Viessmann's own fault tables. Your model name is usually on the front of the boiler or in the user manual.

Model	Meaning
Vitodens 100-W (B1HC/B1KC)	Electrical fan control (control unit) faulty

Can I fix Viessmann FC myself?

No. It needs a Gas Safe registered engineer to diagnose. Tell them the exact code and your boiler's model name.