Medium
bd on Viessmann Vitodens 300-W

Your boiler has lost communication with the remote control unit that manages your second heating circuit, meaning that part of your home may not heat correctly.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

What the manual says

Manufacturer manual

Control mode without remote control: Communication fault - Vitotrol remote control heating circuit M2

From this model's manual
Verified against the Viessmann/Viessmann Vitodens 200 W installation & service manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

DIY fix possible

Check that the Vitotrol remote control is securely docked in its wall bracketInspect the remote control for any low battery warnings if applicableTurn the boiler power off and back on at the fused spur switch to reset the connection

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Related fault codes

bcView →beView →b7View →

All 60 fault codes on the Vitodens 300-W

Seeing a different code? Every code this model can display, in one place.

0F9A9b9C9F101820283038404850515858:05980:092939497:2A2:0A7b0b1b4b5b7b8bAbCbEbFC2C5C6C7CdCECFdAdbdEE4E5E6F0F1F2F3F4F7F8F9FAFdFE

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