Trane Mini Split 5-TIME BLINK Error Code

Updated 2026-08-29 · review status: manual-verified Last verified: 2026-08-29

Quick answer

5-TIME BLINK on Trane mini splits means outdoor power system abnormality - the compressor stopped on overcurrent or startup-failure protection three consecutive times within a minute of starting. Trane marks this stop-use: turn the system off and do not keep resetting; this is compressor/inverter work for a technician.

Severity: high · DIY difficulty: beginner

Safety

Stop here: compressor, electrical, and inverter work is technician-only. Do not open panels, test capacitors, touch wiring, connect gauges, add refrigerant, or keep resetting the system.

What 5-TIME BLINK means

Trane's troubleshooting table lists 5-TIME BLINK as outdoor power system abnormality. The manual says the compressor stops for overcurrent protection or startup-failure protection within one minute after startup, and the condition has occurred three consecutive times. This pattern maps to the stop-use end of Trane's table.

Code meaning varies by series

  • Trane ML series (Mitsubishi-built NTXSMT/NAXSMT outdoor equivalents): Outdoor unit 1-time blink every 2.5 s on the outdoor LED: overcurrent cut-out 3 consecutive times within 1 minute of compressor start - same fault surfaced indoors as the 5-time upper-lamp pattern

Causes, ranked

  1. 1. High system load from dirty filters or blocked outdoor airflow occasional diy-ok

    Check: With the system off, clean/replace indoor filters and clear loose leaves, snow, and debris from around the outdoor coil without removing panels.

    Fix: Restore airflow and power cycle once only; a 5-time blink is a repeat-trip fault, so if it returns, turn the system off and call a technician.

  2. 2. Compressor startup failure or winding fault (locked rotor) occasional pro-only

    Check: Requires clamp-meter startup current measurement against service values.

    Fix: Technician: measure compressor start/current, diagnose windings and starting components.

  3. 3. Inverter PCB or power module (IPM) fault driving overcurrent occasional pro-only

    Check: Inverter output diagnosis needs board-level instruments.

    Fix: Technician: test the inverter/power module and replace the PCB if faulty.

  4. 4. Abnormal supply voltage or wiring to the outdoor unit occasional pro-only

    Check: Voltage measurement at the disconnect is live-electrical work.

    Fix: Technician: verify supply voltage, contactor, and wiring.

  5. 5. Refrigerant overcharge, restriction, or closed stop valve loading the compressor occasional pro-only

    Check: Needs gauges and sealed-system access.

    Fix: Technician: check stop valve open, verify pressures/charge, clear restrictions.

Related codes

trane/3-time-blink · trane/4-time-blink · trane/6-time-blink · trane/7-time-blink · trane/upper-lamp-0-5-second-blink

Commonly searched as: "trane 5-time blink" · "trane error code 5-time blink" · "trane air conditioner 5-time blink"

Sources

  • Trane error codes (upper lamp blink table) - SplitAtlas, sourced from Trane MyLinkDrive NTXWMT-A111A(B) Service Manual Section 9 — verified 2026-08-29
  • Mitsubishi Electric / American Standard NAXSMT-A111AA (Trane ML-series equivalent) Service Manual, 9-4 Troubleshooting Check Table — verified 2026-08-29