471 High

Viessmann 471 Fault Code

The Viessmann 471 fault code means: your boiler's internal sensor for measuring water pressure has lost electrical contact or is faulty, causing the system to stop working until it can safely read the pressure level again.. It appears on 1 Viessmann model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: System pressure sensor not available (lead break or short circuit)
Typical repair cost £140-£260 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Viessmann models that show the 471 fault code

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

Source

Viessmann 471 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