How much does it cost to fix Viessmann error code 72:0?

Typical repair cost for the Viessmann 72:0 fault is £0-90 including labour.

72:0 Low

Viessmann 72:0 Fault Code

Q: What does the Viessmann 72:0 fault code mean?

Your boiler is notifying you that the hot water circulation pump is currently active based on its set schedule, though it may indicate a minor communication lag with the sensor.

Also written as 720 — same fault.

The Viessmann 72:0 fault code means: your boiler is notifying you that the hot water circulation pump is currently active based on its set schedule, though it may indicate a minor communication lag with the sensor.. It appears on 5 Viessmann models in our database.

Technical description: DHW circulation pump: ON according to time program

What causes the Viessmann 72:0 fault?

This code appears when the boiler’s internal control unit recognizes that the secondary hot water pump is running as per its scheduled timer. It is typically a status notification rather than a breakdown, though it can sometimes be triggered by a slight delay in the electrical signal between the pump and the main circuit board. You will usually find your hot water is working perfectly while this code is displayed.

Typical repair cost £0-90 (including labour)

DIY fix possible

Check your hot water time program settings to ensure the 'On' period is intentionalTurn the boiler off at the main isolation switch for 30 seconds and restart itMonitor the display to see if the code clears once the scheduled period ends

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Viessmann models that show the 72:0 fault code

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

Source

Viessmann 72:0 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