Electrolux UNIC AURA Programming Maintenance Troubleshooting page 55

Filling Codes
FL
Normal Filling
FL
Flashes once on startup to verify boiler is full
to
Flashes after 3 minutes without filling
Boiler heating disabled
to
Steady after 105 seconds without filling
Steam/Hot water box disabled to prevent draining boiler
(boiler cold)
(boiler hot)