How much does it cost to fix Ferroli error code 43?

Typical repair cost for the Ferroli 43 fault is £0-120 including labour.

43 Low

Ferroli 43 Fault Code

Q: What does the Ferroli 43 fault code mean?

Your boiler has paused itself because the water pressure in the system is falling outside of the safe operating range, but it should restart automatically once the pressure is corrected.

The Ferroli 43 fault code means: your boiler has paused itself because the water pressure in the system is falling outside of the safe operating range, but it should restart automatically once the pressure is corrected.. It appears on 3 Ferroli models in our database.

Technical description: Temporary shutdown fault - resets automatically as soon as the value comes back within the boiler’s normal working range

Typical repair cost £0-120 (including labour)

DIY fix possible

Check the pressure gauge on the front of the boiler; it should ideally be between 1 and 1.5 bar.If the pressure is too low, use the filling loop to top up the system until the needle reaches the 1.5 bar mark.If the pressure is too high, bleed a small amount of water from a radiator to drop the pressure.Wait for the boiler to detect the correct pressure and clear the code automatically.

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Ferroli models that show the 43 fault code

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

Source

Ferroli 43 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