Error code
18 Current sensor fault
How it shows on the unit OPERATION lamp (green) 5 blinks, TIMER lamp (orange) 3 blinks (each flash 0.5 s on / 0.5 s off), COIL DRY lamp off
Applies to 4 models
ASYA09LEC, ASYA12LEC, AOYR09LECN, AOYR12LECN
What this means
The current sensor (CT) reports a fault.
When to call a technician
This fault involves refrigerant, pressure, or electrical work that must be handled by a certified technician under EU F-gas rules. Do not attempt to open the refrigerant circuit, access mains wiring, or adjust pressure components yourself. Contact a qualified installer or servicer for this one.
See the Fujitsu manual (hosted by an authorized distributor)Hosted by an authorized distributor rather than by the manufacturer. We link to manuals, we never host them.
Using Claude Code or Meta Muse? Connect HeatPump AI and ask it about 18.