Trane Mini Split 2-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, failure-mode recall table

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

Quick answer

2-TIME BLINK on Trane mini splits means indoor coil or room temperature thermistor trouble - the control detected a short or open circuit in those indoor sensor signals. Clear the area around the indoor unit, power cycle once, and stop; recurring blinks are sensor/PCB work for a technician.

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 2-TIME BLINK means

Trane's troubleshooting table lists 2-TIME BLINK as indoor coil thermistor or room temperature thermistor trouble. The failure-mode table says the control detects a short or open circuit in those indoor thermistor signals, stops the fan, and blinks the upper OPERATION INDICATOR lamp 2 times with a 2.5-second pause.

Code meaning varies by series

  • Trane ML series (Mitsubishi-built NTXWMT/NAXWMT) service manual, failure-mode recall table: Room temperature thermistor or indoor coil thermistor short/open circuit detected; same pattern appears in the 9-4 troubleshooting check table with a 2-time blink / 2.5-second OFF cadence

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.

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Sources

Related Mini Split guides

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