What does Vaillant F.28 fault code mean?

F.28 indicates ignition failure - the boiler has failed to ignite after multiple attempts. Check if other gas appliances work, ensure the gas supply valve is fully open, and check if your prepayment gas meter has credit. If the problem persists, call a Gas Safe engineer on 0131 625 0043.

What does Vaillant F.22 fault code mean?

F.22 indicates low water pressure. Check the pressure gauge on your boiler (should be 1.0-1.5 bar), look for visible leaks on radiators and pipes, and re-pressurise via the filling loop if below 1 bar.

How do I fix a boiler fault code?

Some fault codes like low pressure (F.22) can be fixed by re-pressurising your system. However, most fault codes require a Gas Safe registered engineer. Maximus & Co provides 24/7 emergency boiler repairs in Edinburgh with an average 2-hour response time. Call 0131 625 0043.

What is a high severity boiler fault code?

High severity codes include ignition failures (F.28, F.29), gas valve faults (F.26, F.50), flue blockages (F.25, F.35), and overheat protection (F.20). These require immediate attention from a Gas Safe engineer. Do not attempt to fix these yourself.

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