What does the Vaillant F.24 fault code mean?

Your boiler is struggling because it does not have enough water circulating inside it, causing the system to heat up much faster than it safely can.

How much does it cost to fix Vaillant error code F.24?

Typical repair cost for the Vaillant F.24 fault is £90-180 including labour.

Check your boiler's pressure gauge and ensure it is between 1 and 1.5 bar

Water shortage (temperature rise too quick)

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

Almost always a stuck diverter valve on combis.

Six most common causes of dropping pressure.

Each noise points to a different fault.