What does the Vaillant S.2 fault code mean?

Your boiler is struggling to circulate water because it has detected a problem with the flow from the pump.

How much does it cost to fix Vaillant error code S.2?

Typical repair cost for the Vaillant S.2 fault is £180-350 including labour.

Check that your radiator valves are fully open

Pump flow error

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

Six most common causes of dropping pressure.

Each noise points to a different fault.

7 signs repair isn't worth it anymore.