Error code
64 PFC circuit or active filter fault
How it shows on the unit OPERATION lamp (green) 6 blinks, TIMER lamp (orange) 4 blinks, ECONOMY lamp (green) continuous flashing
Applies to 6 models
What this means
The power-factor-correction circuit (09/12 models) or the active filter (14 model) has 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 64.