How much does it cost to fix Ferroli error code LED 5 ON?

Typical repair cost for the Ferroli LED 5 ON fault is £80-120 including labour.

LED 5 ON High

Ferroli LED 5 ON Fault Code

Q: What does the Ferroli LED 5 ON fault code mean?

Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.

Also written as LED5ON — same fault.

The Ferroli LED 5 ON fault code means: your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.. It appears on 1 Ferroli model in our database.

Technical description: Water pressure is not set between 1 - 1,5 bar

Typical repair cost £80-120 (including labour)

DIY fix possible

Locate the external filling loop, which is a silver braided hose with one or two valves connecting your boiler to the mains water supply.Open the valve(s) slowly to allow water into the system until the pressure gauge on the front of the boiler reads between 1 and 1.5 bar.Fully close the valve(s) and ensure no water is dripping from the connection.

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Ferroli models that show the LED 5 ON fault code

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

Falcon Repair: £80-120

Source

Ferroli LED 5 ON 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