What does the Vaillant F.72 fault code mean?

Your boiler is temporarily locked out because it has detected a disagreement or fault between the temperature sensors on its main pipes.

How much does it cost to fix Vaillant error code F.72?

Typical repair cost for the Vaillant F.72 fault is £120-200 including labour.

Manufacturer manual

Flow and/or return sensor fault | Flow and/or return sensor is defective

From this model's manual

Verified against the Vaillant/Vaillant Ecotec Plus Pro 839592 00 2004 installation & service manual.

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

Boiler cover options

A cover plan would handle faults like F.72: no call-out fees, no surprise bills.

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

Almost always a stuck diverter valve on a combi.

Break-even maths on monthly cover.

7 signs repair isn't worth it anymore.