Gree Mini Split L1 Error Code

Updated 2026-08-29 · review status: manual-verified · reviewed by MiniSplitDecoder Editorial Team Last verified: 2026-08-29

Check your model first

The source record does not specify an exact model family.

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

Quick answer

L1 means the indoor unit's humidity sensor is reading open, short, or out of range. The unit may stop or limit dehumidification. Sensor circuits are inside the indoor chassis and are technician work.

Severity: medium · DIY difficulty: easy

Safety

Stop at the single power-cycle check. The humidity sensor sits inside the indoor unit - do not open the chassis, test the sensor, or touch wiring. Technician-only.

What L1 means

L1 means the indoor humidity sensor circuit is open, shorted, or out of range, so the controls cannot trust the humidity reading. The unit may stop or limit operation (especially dry/dehumidify mode). Sensor diagnosis is technician work.

Causes, ranked

  1. 1. Humidity sensor reading out of range (open or short) common pro only

    Check: Requires resistance measurement against the service-manual table.

    Fix: Technician: test and replace the humidity sensor if out of spec.

  2. 2. Loose sensor connector or damaged sensor lead occasional pro only

    Check: Connector inspection is inside the indoor chassis.

    Fix: Technician: reseat or repair the sensor connector.

  3. 3. Moisture or corrosion affecting the sensor circuit occasional pro only

    Check: Requires opening the indoor chassis.

    Fix: Technician: clean/dry the circuit and repair corrosion.

  4. 4. Indoor board input fault after the sensor checks out rare pro only

    Check: Board-level voltage checks only.

    Fix: Technician: diagnose the indoor PCB; replace board if faulty.

Related codes

Cross-references for the same fault family, by brand:

Gree F2 · Gree F1 · Gree F3 · Gree L9

Commonly searched as: "gree l1" · "gree error code l1" · "gree air conditioner l1"

Sources

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