How much does it cost to fix Ferroli error code A08?

Typical repair cost for the Ferroli A08 fault is £120-350 including labour.

A08 High

Ferroli A08 Fault Code

Q: What does the Ferroli A08 fault code mean?

Your boiler has sensed that parts of the internal system have become too hot, causing it to shut down automatically to prevent damage.

The Ferroli A08 fault code means: your boiler has sensed that parts of the internal system have become too hot, causing it to shut down automatically to prevent damage.. It appears on 3 Ferroli models in our database.

Technical description: Overtemperature protection intervention

What causes the Ferroli A08 fault?

This fault occurs when the internal temperature of the boiler rises above a safe limit, usually because water isn't moving through the system fast enough to carry heat away. The most common reasons are a failing circulation pump, a build-up of sludge or limescale blocking the heat exchanger, or a 'pocket' of air trapped within the unit.

This fault is frequently seen when the heating is first turned on after autumn, as pump components can seize up during months of inactivity.

Typical repair cost £120-350 (including labour)

DIY fix possible

Check that your radiator valves are open to allow water to circulate.Ensure there is enough water pressure in the system (typically 1.0 to 1.5 bar).Press the 'Reset' button on the control panel to see if the fault clears.

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Ferroli models that show the A08 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Ferroli A08 fault code information on this page is sourced and cross-checked against the official Ferroli service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026