Viessmann · Vitodens 100-W combi
544 boiler fault code
Vitodens 100-W type B1KF combi
Get a Gas Safe engineer
Free. Enter your postcode.
Renting? Report it to your landlord or housing provider first. They are responsible for gas safety and boiler repairs, and the repair should not cost you.
What 544 means
Lead break, flow temperature sensor, heating circuit 2 with mixer; emergency function operating mode, mixer closes, heating circuit pump operational
Safe check
Note the code shown on the display. Do not open or adjust the boiler, or repeatedly reset it. Contact a Gas Safe registered engineer.
When to contact an engineer
Contact a Gas Safe registered engineer for diagnosis of this fault code.
Safety notice
A boiler fault code alone is not a gas or carbon-monoxide emergency. If you smell gas, a CO alarm sounds, anyone feels unwell, or there is an unsafe flame, leave and call 0800 111 999 from outside.
Source and provenance
- Viessmann Vitodens 100-W types B1HF/B1KF · chapter 7 “Troubleshooting”, “Fault messages” · code 544, printed p. 86; p. 68 equipment-level headnote applies; emergency function/mode means appliance fallback operation, not emergency routing
installation and service instructions for contractors
6167586 GB · 3/2023