Gree Aircon U1 Error Code
Use this Gree U1 error code guide to decide when to stop resetting, what to capture, and what to check before parts are quoted.
What Does Gree U1 Mean?
Gree U1 is listed as phase current detection circuit malfunction for compressor in Multi-Split, Wall-Mounted Split, Ceiling Cassette rows such as Multi GEN2 wall mount, Multi GEN2 cassette. The loaded row is source-backed by official diagnostic material. Confirm the exact model, series, or signal row before accepting a parts quote.
Compressor start, lock, overcurrent, overload, or inverter-drive protection.
Power-module, IPM, voltage, or wiring fault affecting compressor drive.
Compressor mechanical or winding issue after electrical checks are confirmed.
What To Do Now
Use these steps before another reset or parts quote.
Stop using the unit if U1 returns
Stop repeated restarts if U1 returns; compressor and inverter faults can become more expensive when forced to run.
Reset U1 once
Capture the U1 display, then reset once only if there is no burning smell, repeated trip, or hot outdoor unit.
Send these to us
U1 error code, a clear display photo, Gree model stickers, affected rooms, reset result, and trip timing and outdoor-unit behaviour
Send Us What You're Seeing
Share U1, your Gree model, and what happened before it appeared. We'll read it and respond with the right next step before any work is approved.
What To Check Before Repair
Use this split to separate safe evidence capture from the tests a technician should prove before quoting parts.
| You Can Check | Technician Should Confirm |
|---|---|
| Before resetting U1, take a clear display photo. | Confirm whether U1 is compressor start, overload, lock, or drive protection. |
| Capture the Gree indoor and outdoor model stickers so the correct family row is used. | Check supply voltage, inverter output, IPM status, compressor current, and winding readings. |
| Note whether one room, several rooms, or the whole system is affected, plus whether it returns after one reset. | Review trip history and compressor mechanical signs before quoting replacement. |
What Changes The Next Step
These clues decide whether the first check is room-side, shared outdoor-side, refrigerant-side, source-table, or model-family confirmation.
| What You See | What It Points To |
|---|---|
| Only one indoor unit shows U1. | The affected room, indoor board path, wiring route, or local component should be checked first. |
| Several rooms or the outdoor unit show the same U1 fault. | The shared outdoor side, power path, communication trunk, or refrigerant circuit needs priority checking. |
| The outdoor unit hums, starts briefly, or trips soon after startup. | Power, inverter, IPM, compressor current, and winding checks decide the repair path. |
| The model family is different from the row you found online. | Use the model or series filter first; same-looking codes can still belong to different diagnostic tables. |
| The model belongs to Multi-Split, Wall-Mounted Split, Ceiling Cassette rows such as Multi GEN2 wall mount, Multi GEN2 cassette. | The loaded row is source-backed by official diagnostic material. Use the matching source row before quoting parts. |
Compressor Drive Or Replacement Decision
Gree U1 can still be a repair if power, inverter, or module checks find the cause. Compressor replacement should be weighed against age, warranty, and the rest of the system condition.
Inverter or IPM faults are not the same as confirmed compressor mechanical failure.
Compressor winding and current readings should be measured before replacement is discussed.
Older systems need a repair-versus-replace check if compressor-side parts are expensive.
Read Next
Use these if the quote mentions the parts, checks, or repair path this code points to.
Other Gree Error Codes
If the code you're seeing isn't U1, jump to one of these or browse the full Gree list.
Ready to Get Started?
Send the U1 error code, a clear display photo, and Gree model sticker. Send the model sticker so the matching official row can be checked quickly. We can help separate inverter, module, and compressor checks.