Trane Mini Split 7-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

7-TIME BLINK on Trane mini splits means outdoor control system trouble - the inverter PCB or outdoor PCB cannot read data in its nonvolatile memory. Power cycle once at the breaker; if the pattern returns, the outdoor board needs a technician.

Severity: high · 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 7-TIME BLINK means

Trane's troubleshooting table lists 7-TIME BLINK as outdoor control system trouble. The service manual says the inverter PCB or outdoor electronic control PCB cannot read data in nonvolatile memory; the manual directs checking the outdoor board LED pattern and board replacement as the remedy.

Code meaning varies by series

  • Trane ML series (Mitsubishi-built NTXWMT/NAXWMT) service manual: Outdoor control system nonvolatile-memory read failure - same fault also shows as the upper lamp lighting up steady with the outdoor unit not operating; manual remedy is inverter/outdoor PCB replacement

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

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