How much does it cost to fix Ferroli error code ER 11?

Typical repair cost for the Ferroli ER 11 fault is £80-150 including labour.

ER 11 Medium

Ferroli ER 11 Fault Code

Q: What does the Ferroli ER 11 fault code mean?

Your boiler has detected that the water pressure inside the heating system is too high and has shut itself down to prevent damage.

Also written as ER11 — same fault.

The Ferroli ER 11 fault code means: your boiler has detected that the water pressure inside the heating system is too high and has shut itself down to prevent damage.. It appears on 1 Ferroli model in our database.

Technical description: WATER PRESSURE TOO HIGH - Leaks from supply cock, Expansion tank defective, The plant has been filled when cold at an excessively high pressure

Typical repair cost £80-150 (including labour)

DIY fix possible

Locate a radiator in your home, preferably upstairs.Place a cloth and a bowl under the radiator bleed valve.Slowly open the valve to release water until the pressure gauge on the front of your boiler reads between 1.0 and 1.5 bar.Close the valve tightly and check for leaks.

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Ferroli models that show the ER 11 fault code

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

Xignal Repair: £80-150

Source

Ferroli ER 11 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