Gree Mini Split U2 Error Code

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

Check your model first

Multi-zone / VRF platforms (some aggregators)

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

Quick answer

U2 means the outdoor unit detected compressor phase-loss protection - the drive believes a compressor phase connection is missing or current is unbalanced. One safe reset, then technician diagnosis of compressor wiring and drive.

Severity: high · DIY difficulty: easy

Safety

Stop at the single power-cycle check. Compressor terminals sit on live inverter circuitry - do not open the cabinet or test wiring. Technician-only.

What U2 means

U2 means the outdoor unit detected compressor phase-loss protection: the drive sees a missing/unbalanced compressor phase. Homeowners can try one reset; wiring, drive, and compressor checks are technician work.

Code meaning varies by series

Multi-zone / VRF platforms (some aggregators): Wrong setting of the outdoor unit's capacity code / jumper cap

Causes, ranked

1. Brief power event, brownout, or unstable supply voltage common DIY
Check: Power cycle once at the breaker and run a full cycle.
Fix: If one reset clears it and it stays clear, monitor; if it returns, stop resetting.
2. Loose or damaged compressor phase connection occasional pro only
Check: Compressor terminals are inside the outdoor electrical box on live circuitry.
Fix: Technician: inspect and retermine compressor wiring.
3. Inverter drive output fault on one phase occasional pro only
Check: Requires drive-output measurements.
Fix: Technician: diagnose the drive board outputs.
4. Compressor winding fault (open/short phase) rare pro only
Check: Winding resistance testing only.
Fix: Technician: test compressor windings; replace compressor if failed.

Related codes

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

Gree U1 · Gree U3 · Gree H7

Commonly searched as: "gree u2" · "gree error code u2" · "gree air conditioner u2"

Sources

GREE U2 error code - SplitAtlas (Livo R32 manual-aligned, compressor phase-loss protection) — verified 2026-08-29
GREE Troubleshoot Error Codes tool - GreeComfort (U2 compressor protection against phase loss) — verified 2026-08-29
Gree Air Conditioner Error Codes - Luce (U2 compressor protection against loss of phase) — verified 2026-08-29
Gree air conditioner error codes - Snowflake Aircon (U2 capacity-code/jumper variant, VRF context) — verified 2026-08-29

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