474 Medium

Viessmann 474 Fault Code

The Viessmann 474 fault code means: your boiler's internal computer has encountered a software timing error or a communication glitch while trying to run its pre-set operation sequence.. It appears on 1 Viessmann model in our database.

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.

Technical description: Error in scheduled program run monitoring
Typical repair cost £100-350 (including labour)

DIY fix possible

Locate the power button or switch for the boiler.Turn the boiler off for 30 seconds and then turn it back on.Wait for the system to reboot and check if the code clears.

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Viessmann models that show the 474 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Viessmann 474 fault code information on this page is sourced and cross-checked against the official Viessmann service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026