Fujitsu / AIRSTAGE H-series
Fujitsu PUMP DOWN status display
Pump down is a service procedure for moving or discarding the unit. A POWER/MODE three-blink indication during pump down is not a homeowner repair code.
- Urgency
- informational
- Verified
- Jul 30, 2026
- Fix path
- Not an error
What it means
Pump down is a service procedure for moving or discarding the unit. A POWER/MODE three-blink indication during pump down is not a homeowner repair code.
Urgency
Not an error
This is a normal status or service-mode indication, not an error, unless comfort is poor, the status never clears, or a separate SW1 fault code appears.
Likely causes
- Brief power event, brownout, or unstable supply voltage
- Loose power connection, reactor, or outdoor electrical component problem
- Inverter/IPM protection or current-detection fault
- Compressor winding, drive, or outdoor board fault after power checks pass
Homeowner fix
Do not start pump down yourself. If it appears unexpectedly, stop operation once and call a licensed HVAC technician.
When to call a pro
Call a licensed HVAC technician for any pump-down operation. R-32 refrigerant work and service-valve handling are not homeowner tasks.
Repair vs replace
This is a status display, not a repair-or-replace decision.
Your Fujitsu model
AIRSTAGE H-series model pages in the Fujitsu catalog help compare this repair path with current replacement options.
- 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.
Open parts pageFor your technician
Technician note: Section 14-4 requires correct valve sequence and compressor-off precautions during pump down. 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, 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
Do not start pump down yourself. If it appears unexpectedly, stop operation once and call a licensed HVAC technician.
Manual trigger
Pump down is a service procedure for moving or discarding the unit. A POWER/MODE three-blink indication during pump down is not a homeowner repair code.
Related codes
Source
- Section
- Section 14-4 Pump down
- Page
- PDF pages 255-256; manual pages 249-250
Short quote: "During pump down, the LED (POWER/MODE) blinks 3 times"
Sourced Jul 2026