Fujitsu TEST RUN status display

What it means

Test run starts from SW1 after the outdoor unit is prepared for COOL or HEAT test operation. A POWER/MODE one-blink indication during test run is not a fault code.

Urgency

Likely causes

1. Brief power event, brownout, or unstable supply voltage
2. Loose power connection, reactor, or outdoor electrical component problem
3. Inverter/IPM protection or current-detection fault
4. Compressor winding, drive, or outdoor board fault after power checks pass

Homeowner fix

If a technician started test run, let them finish. If it appears during normal use, stop the system once and call for service if normal controls do not return.

When to call a pro

Call for service if test run will not stop, the system ignores normal controls, or a separate SW1 error code appears.

Repair vs replace

This is a status display, not a repair-or-replace decision.

• Fujitsu AIRSTAGE H-series Compact Cassette 9,000 BTU R-32 208/230V (ACUH09KUAS / AOUH09KUAS1)

  AIRSTAGE H-series

• Fujitsu AIRSTAGE H-series Compact Cassette 12,000 BTU R-32 208/230V (ACUH12KUAS / AOUH12KUBS1)

  AIRSTAGE H-series

• Fujitsu AIRSTAGE H-series Floor-Mounted Console 12,000 BTU R-32 208/230V (AGUH12KUAS / AOUH12KUBS1)

  AIRSTAGE H-series

• Fujitsu AIRSTAGE H-series Mid Static Duct 12,000 BTU R-32 208/230V (ARUH12KUAS / AOUH12KUBS1)

  AIRSTAGE H-series

Parts for this line

The parts catalog for Fujitsu AIRSTAGE H-series lists 6 sourced replacement parts for this product line.

For your technician

Technician note: Section 14-2 starts/stops test run by pushing TEST RUN/SW1 for more than 3 seconds; do not leave the system in test run for a long time. Page context: Fujitsu maps this display to the AIRSTAGE H-series line; source: Fujitsu AOUH18-45KWAS/KWAH R-32 Design & Technical Manual; display convention: match the letter T, letter E, letter S, letter T, letter R, letter U, and letter N marker exactly before comparing neighboring codes.

Which systems show it

• Fujitsu Halcyon/AIRSTAGE R-32 AOUH18KWAS2, AOUH24KWAS3, AOUH36KWAS4, and AOUH45KWAS5 outdoor-unit manuals where Section 14-3 lists the same SW1/MONITOR error-code table.
• Fujitsu AOUH18KWAH2 and AOUH36KWAH4 XLTH sibling design manuals where the extracted Section 14-3 table matches the KWAS manuals.

Related troubleshooting

Use the symptom guide alongside the exact display code if the unit is flashing, cycling, or showing comfort symptoms.

Reset note

If a technician started test run, let them finish. If it appears during normal use, stop the system once and call for service if normal controls do not return.

Manual trigger

Test run starts from SW1 after the outdoor unit is prepared for COOL or HEAT test operation. A POWER/MODE one-blink indication during test run is not a fault code.

Related codes

Source

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