Ferroli Appliance Repair in St David's

What does error F20 mean on a Ferroli boiler?

Error F20 on a Ferroli boiler (primarily Domiproject D/F models) indicates a combustion quality anomaly. This may be caused by fan failure, incorrect air aperture, blocked or incorrectly sized chimney, or electronic board issues. The boiler will attempt to restart automatically. If the fault persists, contact a Gas Safe registered engineer.

What does error A11 mean on a Ferroli boiler?

Error A11 on a Ferroli boiler indicates a return sensor fault causing a permanent lockout - the sensor is damaged or its wiring is shorted or disconnected. Contact a Gas Safe registered engineer to test the sensor and wiring connections.

What does error A16 mean on a Ferroli boiler?

Error A16 on a Ferroli boiler indicates gas valve failure due to disconnected wiring or a faulty valve. Turn off the boiler and contact a Gas Safe registered engineer immediately - the gas valve may need replacement.

What does error A64 mean on a Ferroli boiler?

Error A64 on a Ferroli boiler means the maximum number of consecutive resets has been exceeded without resolving the fault. Stop trying to reset the boiler and contact a Gas Safe registered engineer to diagnose and repair the underlying problem.

What does error A01 mean on a Ferroli boiler?

Error A01 on a Ferroli boiler means no burner ignition - the boiler fails to ignite because no flame signal is being received. Check your gas supply is on, verify the boiler has power, and try resetting by pressing the reset button for 5-10 seconds. If the error persists, contact a Gas Safe registered engineer as the electrodes, gas valve, or PCB may need inspection.

Why does my Ferroli boiler show the F37 error code?

The F37 error code indicates that the water pressure in your heating system has fallen below the minimum required level. Check the pressure gauge and if it reads below 1.0 bar, repressurise the system using the filling loop.

How long does a Ferroli boiler last?

A well-maintained Ferroli boiler can provide reliable heating for 10 to 15 years. Regular annual servicing is essential to achieve this lifespan.

What is a condensing boiler and how does it work?

A condensing boiler recovers heat from flue gases that would otherwise be lost. The water vapour produced during combustion is condensed back into liquid form, releasing additional heat energy. This process makes condensing boilers significantly more efficient than older non-condensing models, achieving efficiency ratings over 90%. The condensation process produces acidic water that drains away through the condensate pipe.

What does modulating burner mean on my Ferroli boiler?

A modulating burner automatically adjusts its output to match the heating demand of your home. Rather than running at full power and cycling on and off, the boiler continuously varies its flame size. This provides more stable temperatures, reduces energy consumption, and extends boiler life. Ferroli condensing boilers can modulate down to as low as 10% of their maximum output.

Why does my Ferroli boiler keep losing pressure?

If your boiler loses pressure repeatedly after repressurising, there is usually an underlying issue such as a leak in the heating system, a faulty pressure relief valve, or a problem with the expansion vessel. Check visible pipework and radiator valves for signs of leaks, and contact an engineer if the problem persists.