What does the Vaillant F.75 fault code mean?

Your boiler is unable to confirm that water is moving around the system because it cannot detect a change in pressure when the internal pump starts.

How much does it cost to fix Vaillant error code F.75?

Typical repair cost for the Vaillant F.75 fault is £150-350 including labour.

Manufacturer manual

No pressure change detected when starting the pump

Shared across the ecoFIT Pure range

This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Boiler cover options

A cover plan would handle faults like F.75: no call-out fees, no surprise bills.

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

On a combi it is usually the diverter valve. On a system boiler, the motorised valve.

1 to 1.5 bar when cold on most UK boilers, from the manuals.

Each noise points to a different fault.