HVAC Code Lookup

Fujitsu Mini-Split Code 64

Hard lockoutShown as: OPERATION lamp blinks 6 times, TIMER lamp blinks 4 times, ECONOMY lamp blinking continuously

PFC circuit error or active filter error, depending on model. On 9RLS3/12RLS3 the inverter output DC voltage went above 415 V for over 3 seconds; on 15RLS3, 15RLS3H and 30RLXEH the inverter input DC voltage went above 425 V or below 80 V, or a momentary power interruption occurred at low voltage.

Manual wording: “PFC Circuit Error (9/12RLS3) - When inverter output DC voltage is higher than 415V for over 3 seconds, the compressor stops. If the same operation is repeated 5 times, the compressor stops permanently.”

Documented for: 9RLS3, 12RLS3 (PFC circuit error); 15RLS3, 15RLS3H, 30RLXEH (active filter error); RGLX models (active filter / PFC circuit error)

Likely causes, most common first

  1. Voltage drop, brownout, or electrical noise on the supply to the indoor or outdoor unit
  2. Momentary power interruption
  3. Loose or erroneous connector connection in the outdoor electrical box
  4. Failed active filter module (ACTPM) or main PCB

What you can safely check yourself

  • Note whether the fault followed a power outage, brownout, or generator switchover
  • Turn the power off at the outdoor disconnect and the breaker for about 5 minutes, then restore power

When to call a technician

If the compressor repeats this five times it stops permanently. Diagnosing needs live DC measurements in the inverter section, so call a licensed technician.

A Fujitsu mini-split throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.

Source

Other Fujitsu codes