Low Warning
95:1 on Viessmann Vitodens 300-W

Your boiler is having trouble communicating with the external internet or remote control monitoring accessory.

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

With Vitocom 100 communication interface; automatic recognition

What causes this fault?

This fault occurs when the boiler's main control board fails to detect or synchronise with the plug-in internet module during its startup sequence. The most common reason is a loose internal data cable or a communication handshake error between the boiler and the Wi-Fi interface.

DIY fix possible

Check that your internet router is switched on and workingEnsure all cables between the boiler and the communication module are securely plugged inReset the boiler to see if the communication link restarts

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Related fault codes

95:0View →CFView →

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