How much does it cost to fix Ferroli error code 42?

Typical repair cost for the Ferroli 42 fault is £80-200 including labour.

42 Low

Ferroli 42 Fault Code

Q: What does the Ferroli 42 fault code mean?

Your boiler has temporarily paused because it detected a measurement that was slightly outside its normal limits, and it will try to restart itself automatically once everything settles down.

The Ferroli 42 fault code means: your boiler has temporarily paused because it detected a measurement that was slightly outside its normal limits, and it will try to restart itself automatically once everything settles down.. 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 £80-200 (including labour)

DIY fix possible

Wait for 10-15 minutes to see if the boiler resets and restarts itselfCheck that your radiators are bled and there is no air in the systemEnsure your boiler pressure is topped up to between 1 and 1.5 bar

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Ferroli models that show the 42 fault code

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

Source

Ferroli 42 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