What the manual says
Manufacturer manualInsufficient pressure in central heating system. Indicated by the bottom red light on the left hand side of the facia illuminating (bar symbol).
From this model's manual
Verified against the Ferroli/Ferroli Domina 80e installation & service manual.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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All 27 fault codes on the DOMINAplus F24D
Seeing a different code? Every code this model can display, in one place.
4 (Flashing Light)4 (Permanent Light)5 (Flashing Light)5 (Permanent Light)454750A24d4E03E05E06F11Heating demand light ONLED 4LED 4 (Flashing light)LED 4 (Permanent light)LED 5LED 5 (Flashing light)LED 5 (Permanent light)LED1LED2Low water pressure light ONRed LED Out (Lockout)Red light (Egg timer symbol)Tap symbol light ON