Gree Split AC Error Code E4 — What It Means & How to Fix It

What Does This Error Mean?

E4 means the hot gas leaving the compressor is above safe temperature limits. This is a critical fault — continued operation can permanently destroy the compressor. Do not restart the AC until the root cause is found and fixed.

Affected Models

Gree FAIRY Series
Gree LOMO Series
Gree U-MATCH Series
Gree PULAR Series
Gree Inverter Split System

Common Causes

Dirty outdoor condenser coil preventing heat from escaping
Low refrigerant charge causing the compressor to work harder and run hotter
Extremely high outdoor ambient temperature with restricted airflow
Blocked airflow around the outdoor unit on all sides
Faulty discharge temperature sensor giving incorrect readings

How to Fix It

Turn the AC off immediately and do not attempt to restart it.

E4 indicates a temperature that can melt compressor windings or cause a refrigerant breakdown. Immediate shutdown limits the damage.
Let the system cool for at least 30–60 minutes before doing anything else.

The compressor and discharge line need time to cool to a safe temperature before you approach the outdoor unit.
Inspect the outdoor unit. Clear any debris, plants, or obstructions within 60 cm on all sides.

The outdoor unit needs unrestricted airflow to reject heat. Even partial blocking can push discharge temperatures to dangerous levels.
Rinse the outdoor condenser coil fins with a garden hose on a gentle setting if they appear dirty.

Clogged fins are the most common cause of E4 in hot weather. A clean coil can reduce discharge temperature by 10–20°C.
After cleaning, attempt one restart. Monitor for 10 minutes. If E4 returns, turn off and call a technician.

If the fault returns despite clean coils and clear airflow, the refrigerant charge or compressor itself needs professional inspection.

When to Call a Professional

E4 is a critical fault — call a technician if cleaning the outdoor unit does not resolve it. Low refrigerant and compressor issues both require professional diagnosis and equipment. Do not delay — a failed compressor is the most expensive AC repair possible.

Frequently Asked Questions

How serious is the E4 error on a Gree AC?

E4 is the most serious heat-related fault a Gree AC can show. Ignoring it and restarting the unit risks permanent compressor failure. Act quickly — shutdown and investigate before running the AC again.

Can low refrigerant really cause E4?

Yes — when the refrigerant level is low, the compressor has to work much harder to move heat. This extra work generates excessive heat at the discharge port. A technician needs gauges to confirm and correct the refrigerant charge.

Is it safe to restart the AC after an E4 error?

Only restart after the system has cooled completely and you have addressed the likely cause. If E4 appears again within minutes, stop immediately and call a technician. Repeated restarts with an active E4 cause will shorten the compressor life significantly.