Low Warning
95:0 on Viessmann Vitodens 333-F

Your boiler is trying to connect to a remote control accessory that it cannot find or which has lost power.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description

Without Vitocom 100 communication interface

What causes this fault?

This fault occurs when the boiler's main control board expects to be talking to an external communication module, like a Vitocom 100, but cannot find it on the system. The most common reason is a loose or damaged data cable between the module and the boiler, or the internal communication component has lost power and stopped sending a signal.

DIY fix possible

Check if your Vitocom internet gateway or remote control hub is plugged in and powered onCheck your home internet router is working correctlyPress the Reset button on the boiler control panel

Find a Gas Safe engineer
Search the official register →

Related guides you might find useful

Boiler won't turn on — 9-step checklist

Work through these before the call-out.

Read →

Yellow or orange flame — CO safety

Safety-critical — turn off, read this.

Read →

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →