32:0 High

Viessmann 32:0 Fault Code

Also written as 320 — same fault.

The Viessmann 32:0 fault code means: your boiler has been forced to shut down its water circulation pumps by an external safety device or a control signal from your heating system's management unit.. It appears on 5 Viessmann models 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: Influence of 'External lockout' signal on circulation pumps: All pumps are controlled
Typical repair cost £120-250 (including labour)

Engineer required

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

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Viessmann models that show the 32:0 fault code

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

Source

Viessmann 32:0 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 27 April 2026