Low
LED 2 on P.C.B. alight on Ferroli Combi 77 FF Popular

Your boiler is receiving electrical power, but if the display isn't working otherwise, there may be a blown fuse on the internal circuit board.

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

Electric mains on; if not check fuses 2 Amp. and 125 mAmp. on P.C.B. and external fuses

From this model's manual
Verified against the Ferroli Combi 77 Ff Popular 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.

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Avoid the next call-out bill

A cover plan would handle faults like LED 2 on P.C.B. alight: no call-out fees, no surprise bills.

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