Low
LED4 (Flashing) on Ferroli Falcon

Your boiler is currently in standby mode and is working exactly as it should, waiting for a signal to provide heat or hot water.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

What the manual says

Manufacturer manual

Central heating stand-by

From this model's manual
Verified against the Ferroli Falcon installation & service manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

DIY fix possible

Check your room thermostat is set to a higher temperature than the current room temperatureEnsure your heating timer or programmer is currently in an 'on' periodVerify that the boiler's own selector switch is set to the heating or hot water mode

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Avoid the next call-out bill

A cover plan would handle faults like LED4 (Flashing): no call-out fees, no surprise bills.

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