GREE U5 error code

What it means

U5 means the outdoor control system is seeing current detection that does not make sense. The manual also points to low refrigerant as a possible condition, so this belongs with a licensed technician rather than repeated resets. Manual trigger: U5 means the unit current-detection circuit is abnormal.

Urgency

Likely causes

1. Brief power event, brownout, or unstable supply voltage
2. Loose power connection, reactor, or outdoor electrical component problem
3. Inverter/IPM protection or current-detection fault
4. Compressor winding, drive, or outdoor board fault after power checks pass

Homeowner fix

Turn the system off and reset power once. Expected result: a temporary control reading clears; if U5 returns, stop running the unit and schedule service.

When to call a pro

Call a licensed HVAC technician if U5 returns or cooling/heating is weak. Tell them the manual links U5 to current detection and possible low refrigerant.

Repair vs replace

A board or refrigerant diagnosis may be repairable, but repeated low-charge findings or major outdoor-board work on older equipment should be compared with replacement.

• GREE Livo R32 9,000 BTU (230V)

  Livo R32

• GREE Livo R32 9,000 BTU R-32 115V (LIV09HP115V1R32AH / LIV09HP115V1R32AO)

  Livo R32

• GREE Livo R32 12,000 BTU (230V)

  Livo R32

• GREE Livo R32 12,000 BTU R-32 115V (LIV12HP115V1R32AH / LIV12HP115V1R32AO)

  Livo R32

Parts for this line

The parts catalog for GREE Livo R32 lists 8 sourced replacement parts for this product line.

For your technician

Technician note: check operating current, current-detection circuit, refrigerant charge/leak indicators, compressor behavior, and outdoor board. Page context: GREE maps this display to the Livo R32 line; source: GREE R32 residential mini-split service manuals; display convention: match the letter U and five marker exactly before comparing neighboring codes.

Which systems show it

• GREE LIVO R32 wall-mounted single-zone systems.
• GREE VIREO R32, ENVO R32, and Sapphire R32 wall-mounted single-zone systems using the common GREE R32 high-wall diagnostic table.
• GREE Free Match/Multi R32 and Free Match ECO/Multi ECO R32 systems when the connected indoor unit uses this common GREE indoor display table; GREE notes that multi-zone codes can differ by indoor unit type.

Related troubleshooting

Use the symptom guide alongside the exact display code if the unit is flashing, cycling, or showing comfort symptoms.

Reset note

Turn the system off and reset power once. Expected result: a temporary control reading clears; if U5 returns, stop running the unit and schedule service.

Manual trigger

U5 means the unit current-detection circuit is abnormal.

Related codes

Source

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