HVAC Code Lookup

Fujitsu Mini-Split Code 22

Soft lockoutShown as: OPERATION lamp blinks 2 times, TIMER lamp blinks 2 times, ECONOMY lamp blinking continuously

Indoor unit capacity error on a multi-zone system. The total capacity of the connected indoor units is above the maximum or below the minimum the outdoor unit will accept.

Manual wording: “Indoor Unit Capacity Error - The total capacity of the indoor units has been exceeded or is under the minimum acceptable range.”

Documented for: RLF/RLF1, LPAS and LUAS1 multi-zone indoor units; AOU48RLXFZ shows E221

Likely causes, most common first

  1. Too much or too little total indoor capacity connected to the condenser
  2. Broken field wiring so the condenser cannot see one or more indoor units
  3. Failed indoor controller PCB on the missing zone

What you can safely check yourself

  • Check that every indoor head still has power (breaker and any zone disconnects on)
  • Turn the system off at the breaker for about 5 minutes, then back on

When to call a technician

Fujitsu notes that on multi-zone systems this code usually means the condenser has lost communication with one or more heads. Tracing that takes meter work on field wiring, so call a technician.

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

Sources

Other Fujitsu codes