How House Works

Daikin L5: output overcurrent, what to check

By How House Works EditorialBased on Daikin manualsChecked against sources Updated

Daikin remote controller display

L5

“OUTPUT OVERCURRENT”

FTXM-WVJU9, FTXQ-ASBU9, FTX/FTXN-NMVJU, FTXS30/36 · FTXM-WVJU9 Operation Manual, p. 50; FTXQ-ASBU9 Operation Manual, p. 28; FTX/FTXN-NMVJU Operation Manual, p. 30; FTXS30/36 Operation Manual, p. 36
Owner checks, then technician

Covered by the L3, L4, L5 owner check in the FTXM-WVJU9 and FTXQ-ASBU9 manuals only (FTXM-WVJU9 Operation Manual, p. 49; FTXQ-ASBU9 Operation Manual, p. 27). The FTXM-W/V service manual calls L5 “Output overcurrent detection” and marks it “Displayed only when system-down occurs” (FTXM-W/V Service Manual SiUS042113EA, p. 96).

What it means

The two kinds of manual describe L5 from different sides. The FTXM-WVJU9 and FTXQ-ASBU9 owner’s charts group it with L3 and L4 and say: “The temperature inside the outdoor unit has become too high, so operation has stopped.” FTXM-WVJU9 Operation Manual, p. 49; FTXQ-ASBU9 Operation Manual, p. 27. The service manual describes current, not temperature: an output overcurrent is detected by checking the current in the inverter DC section, and L5 is also set by a position signal error or a speed error while the compressor runs. If L5 repeats, the system shuts down, and it resets after about 11 minutes of continuous running without any other error FTXM-W/V Service Manual SiUS042113EA, p. 138. The FTK-B/FTX-B manual gives about 5 minutes FTK-B/FTX-B Service Manual DAMA-SM-23-006, p. 87. The service table marks L5 “Displayed only when system-down occurs” FTXM-W/V Service Manual SiUS042113EA, p. 96.

Check these first

  1. Check that the OPERATION lamp blinks at about 0.5-second intervals and read the code, as described in the Daikin code guide FTXM-WVJU9 Operation Manual, p. 49.
  2. On FTXM-WVJU9 and FTXQ-ASBU9 units, the chart line for L3, L4 and L5 reads: “Is there anything blocking the air outlet of the outdoor unit? After turning off the circuit breaker, remove the obstruction, then turn the power on again and operate.” FTXM-WVJU9 Operation Manual, p. 49; FTXQ-ASBU9 Operation Manual, p. 27.
  3. Keep the area around the outdoor unit clear. The manual says obstacles close to the outdoor unit may lower its performance, and not to let leaves and other debris build up around it FTXM-WVJU9 Operation Manual, p. 4.
  4. Keep your hands out of the unit. The same manuals say not to put a finger or other objects into the air inlet or outlet, because the fan rotates at high speed, and never to remove the fan guard FTXM-WVJU9 Operation Manual, p. 3; FTXQ-ASBU9 Operation Manual, p. 3.
  5. After the power is back on, watch the lamp. If it stays lit after the unit has run for a while, keep using it. If it blinks again, turn off the circuit breaker and call your dealer FTXM-WVJU9 Operation Manual, p. 50; FTXQ-ASBU9 Operation Manual, p. 28.

The FTX/FTXN-NMVJU and FTXS30/36 manuals give L5 no step of its own. Their general step for a blinking lamp also covers obstructions at the indoor and outdoor units, followed by a restart and a call to your dealer or service shop if the lamp still blinks FTX/FTXN-NMVJU Operation Manual, p. 27; FTXS30/36 Operation Manual, p. 34.

When to call a licensed technician

The FTXM-W/V service manual lists these causes for L5 FTXM-W/V Service Manual SiUS042113EA, p. 138:

  • poor installation condition, or a closed stop valve;
  • a defective power module, wrong internal wiring, or a defective outdoor unit PCB;
  • abnormal power supply voltage, or supply voltage out of specification;
  • a defective compressor.

The AXVJU manual adds a poor connection between the main board and the IPM board AXVJU Service Manual SM-5WM-Y-NA-B1, p. 56. These are checks on the inverter, the compressor and the power supply. The service manual warns that working on equipment connected to power may cause an electric shock and that the outdoor unit’s step-up capacitor must be discharged before repair work FTXM-W/V Service Manual SiUS042113EA, pp. 2–3, and the owner’s manual says not to do electrical work unless you are licensed to do so FTXM-WVJU9 Operation Manual, p. 4.

Notes for different models

  • FTX/FTK-BXVJU and the remote manuals call L5 “IPM error / IGBT error” FTX/FTK-BXVJU Operation Manual, p. 1, section 9; BRC52B Remote Controller Manual, p. 1-4; BRC51D61 Wired Remote Controller Manual, p. 12. The AXVJU manual says “IPM ABNORMALITY”, and the FTX-W and FTXS-L service tables “Output overcurrent detection” AXVJU Service Manual SM-5WM-Y-NA-B1, p. 34; FTX-W Service Manual SiUS042228E, p. 68; FTXS-L Service Manual SiUS091133, p. 94.
  • The FTX/FTK-BXVJU poster has no chart by code; it says to call your local dealer or serviceman if the fault persists FTX/FTK-BXVJU Operation Manual, p. 1, section 10.

Related Daikin codes

  • L3 “ELECTRICAL PARTS HEAT FAULT”
  • L4 “HIGH TEMPERATURE AT INVERTER CIRCUIT HEATSINK”
  • E7 “DC FAN MOTOR FAULT”

See also

Other ductless mini-splits: Fujitsu, Mitsubishi Electric, MrCool

All Daikin codes

Daikin is a trademark of its owner. How House Works is not affiliated with or endorsed by Daikin.

Sources

  1. Daikin Comfort Technologies North America (document library). FTXM-WVJU9 Operation Manual. 3P686871-1A, page stamp 2022/05/30; covers FTXM09/12/18/24WVJU9. Listed under ATMOSPHERA in Daikin's document library.. Accessed Oct 13, 2026.
  2. Daikin Comfort Technologies North America (document library). FTXQ-ASBU9 Operation Manual. 3P741457-13J, English; page stamp 2024/11/19; covers FTXQ09ASBU9 and FTXQ12ASBU9. Listed under OTERRA 115V. The library list shows only the French and Spanish files of this manual; the English file is served at this address.. Accessed Oct 13, 2026.
  3. Daikin Comfort Technologies North America (document library). FTX/FTXN-NMVJU Operation Manual. 3P379751-4C, page stamp 11/6/2015; covers FTX09/12/15/18/24NMVJU and FTXN09/12/18/24NMVJU. Not in Daikin's current library list; the file is still served from daikincomfort.com.. Accessed Oct 13, 2026.
  4. Daikin Comfort Technologies North America (document library). FTXS30/36 Operation Manual. 3P228444-4K, page stamp 3/28/2013; covers FTXS30HVJU, FTXS36HVJU, FTXS30LVJU and FTXS36LVJU. Not in Daikin's current library list; the file is still served from daikincomfort.com.. Accessed Oct 13, 2026.
  5. Daikin Comfort Technologies North America (document library). FTX/FTK-BXVJU Operation Manual. 3P601789-2 E (cover label); no printed date; covers FTX, FTXB and FTK09/12/18/24BXVJU; R410A. A poster with one page per language (English, Spanish, French) and no page numbers: citations give PDF page 1 and the poster section. The same file is also listed under ENTRA.. Accessed Oct 13, 2026.
  6. Daikin Comfort Technologies North America (document library). BRC52B Remote Controller Manual. OM-BRC52B-0617(2)-DAIKIN USA, Part No. R08019046595B; print stamp 10/30/2017; covers remote controllers BRC52B61/62/63/64/65. Does not name the indoor units. The library lists it under ENTRA.. Accessed Oct 13, 2026.
  7. Daikin Comfort Technologies North America (document library). BRC51D61 Wired Remote Controller Manual. R08019049297B; print stamp 7/12/2022. Does not name the indoor units. The library lists it under OTERRA (cooling only) and ENTRA.. Accessed Oct 13, 2026.
  8. Daikin Comfort Technologies North America (document library). FTXM-W/V Service Manual SiUS042113EA. SiUS042113EA, revision of 01/2023; covers FTXM09/12/18/24WVJU9 and FTXM-VVJU with RXM outdoor units. Accessed Oct 13, 2026.
  9. Daikin Comfort Technologies North America (document library). FTK-B/FTX-B Service Manual DAMA-SM-23-006. DAMA-SM-23-006, first edition 04/2023; covers FTK09/12/18/24BXVJU and FTX09/12/18/24BXVJU with RK/RX-BXVJU outdoor units. Accessed Oct 13, 2026.
  10. Daikin Comfort Technologies North America (document library). AXVJU Service Manual SM-5WM-Y-NA-B1. SM-5WM-Y-NA-B1; no printed date (PDF created 2021-09-29); covers FTKB/FTKN/FTXB/FTXN09/12/18/24AXVJU. Listed under ENTRA.. Accessed Oct 13, 2026.
  11. Daikin Comfort Technologies North America (document library). FTX-W Service Manual SiUS042228E. SiUS042228E, first edition 10/2022; covers FTX30/36WVJU9 with RK30/36WMVJU9 or RX30/36WMVJU9. Listed under POLARA.. Accessed Oct 13, 2026.
  12. Daikin Comfort Technologies North America (document library). FTXS-L Service Manual SiUS091133. SiUS091133; no printed date (PDF created 2013-01-11); covers FTXS09–36LVJU and FDXS09/12LVJU. Not in Daikin's current library list; the file is still served from daikincomfort.com.. Accessed Oct 13, 2026.