LED 5 bar (Flashing light) High

Ferroli LED 5 bar (Flashing light) Fault Code

Also written as LED5BARFLASHINGLIGHT — same fault.

The Ferroli LED 5 bar (Flashing light) fault code means: your boiler has detected that there is not enough water inside your heating system to run safely and correctly.. It appears on 1 Ferroli model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Insufficient pressure in central heating system
Typical repair cost £80-120 (including labour)

DIY fix possible

Locate the external filling loop (a flexible metal or braided pipe) underneath your boiler.Open the small valve handle on the filling loop to allow cold water into the system until the pressure gauge reads between 1.0 and 1.5 bar.Close the valve tightly to prevent over-pressurisation.

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Ferroli models that show the LED 5 bar (Flashing light) fault code

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

Source

Ferroli LED 5 bar (Flashing light) 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