Fujitsu PUMP DOWN AUTO STOP status display

What it means

If pump down is not stopped manually, the manual says operation stops automatically after 15 minutes and the LEDs show the pump-down stop indication. That timeout is not a normal comfort-mode error code.

Urgency

Likely causes

1. Dirty filters, blocked coil airflow, or an outdoor clearance problem increasing pressure or temperature
2. Low charge, overcharge, leak, or refrigerant-flow restriction
3. Discharge, pressure, or refrigerant sensor reading outside range
4. Compressor, valve, or outdoor board issue after airflow and charge are verified

Homeowner fix

Leave the system off and do not open service valves or refrigerant fittings. Have a licensed technician verify the pump-down state before using the unit.

When to call a pro

Call a licensed HVAC technician if this appears, especially after relocation, disposal work, or service-valve work.

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: if pump down stops before completion due to an error, Section 14-4 says to correct the error before completing pump down or recover refrigerant from the service port. 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 P, letter U, letter M, letter P, letter D, letter O, letter W, letter N, letter A, letter U, letter T, letter O, letter S, letter T, letter O, and letter P 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

Leave the system off and do not open service valves or refrigerant fittings. Have a licensed technician verify the pump-down state before using the unit.

Manual trigger

If pump down is not stopped manually, the manual says operation stops automatically after 15 minutes and the LEDs show the pump-down stop indication. That timeout is not a normal comfort-mode error code.

Related codes

Source

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