Trane Mini Split 6-TIME BLINK Error Code

Updated 2026-08-30 · review status: manual-verified · reviewed by MiniSplitDecoder Editorial Team Last verified: 2026-08-30

Check your model first

  • Trane ML series (Mitsubishi-built NTXWMT/NAXWMT) service manual

Match the model on your equipment label to the linked manufacturer documentation. The same code can mean different things across model families.

Quick answer

6-TIME BLINK on Trane mini splits means outdoor thermistor trouble - an outdoor temperature sensor was detected as shorted or open while the compressor ran. Keep the outdoor unit clear of debris and power cycle once; sensor testing and replacement are technician work.

Severity: medium · DIY difficulty: easy

Safety

Stop at the breaker power-cycle and any plug-accessible checks (filters, remote settings, visible wiring). The outdoor unit's capacitor holds a lethal charge and the refrigerant circuit is both pressurized and (on R-32 units) flammable — opening panels or servicing the sealed system is licensed-technician work (EPA 608).

What 6-TIME BLINK means

Trane's troubleshooting table lists 6-TIME BLINK as outdoor thermistor trouble. The service manual says outdoor thermistors are detected as shorted or open during compressor operation, and the upper OPERATION INDICATOR lamp blinks 6 times with a 2.5-second pause.

Code meaning varies by series

  • Trane ML series (Mitsubishi-built NTXWMT/NAXWMT) service manual: Outdoor thermistor (discharge, coil, ambient, or suction sensor) short/open circuit detected; remedy is thermistor testing per 9-5 criterion tables and outdoor unit service

First checks before service

This page currently documents the safe reset triage. If the code returns, use the linked source manual or a qualified technician for code-specific diagnosis.

  1. 1. One-time fault event (power disturbance or transient sensor reading) common DIY

    Check: Power-cycle at the breaker/disconnect (or unplug for CPAP), restore, and run the system while watching for the code.

    Fix: If the code does not return after a full run cycle, the fault was transient — monitor, no repair needed.

  2. 2. Fault persists after a clean reset occasional pro only

    Check: If the code returns immediately or every session, note the conditions (startup, heating, after rain).

    Fix: A persisting code points at the component the manual assigns to this code — that repair is technician territory.

Commonly searched as: "trane 6-time blink" · "trane error code 6-time blink" · "trane air conditioner 6-time blink"

Sources

Related Mini Split guides

Mini-Split Communication Error: DIY Checks · Mini-Split Flashing Light Decoder: Blink Patterns · Mini-Split Maintenance Checklist: Seasonal DIY Tasks · Mini-Split Not Cooling: Ranked Causes and DIY Checks