Viessmann · Vitodens 100-W combi

16 boiler fault code

Vitodens 100-W type B1KF combi

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What 16 means

Short circuit, solar cylinder temperature sensor (bottom)

Gas Safe engineer: The code remains or returns after the step above, or no home step applies; arrange diagnosis by a Gas Safe registered engineer.

A boiler fault code alone is not a gas or carbon-monoxide emergency. If you smell gas, a CO alarm sounds, or someone has possible carbon-monoxide symptoms, leave and call 0800 111 999 from outside.

Safe check

Note the code shown on the display. Do not open, adjust or repeatedly reset the boiler. Contact a Gas Safe registered engineer.

When to contact an engineer

The code remains or returns after the step above, or no home step applies; arrange diagnosis by a Gas Safe registered engineer.

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.

Source and provenance

Viessmann Vitodens 100-W types B1HF/B1KF · chapter 7 “Troubleshooting”, “Fault messages” Cause column · code 16, p. 69; p. 68 equipment-level headnote applies
installation and service instructions for contractors
6167586 GB · 3/2023