Unit stops and displays E3; may occur during cooling or heating; outdoor unit may shut down abruptly.

Safety first: Do not attempt to open refrigerant lines or braze connections. Low pressure usually indicates a leak that must be handled by a licensed technician.

• Step 1 – Basic reset: Turn OFF the system at the remote and breaker for 10 minutes, then restart. If E3 reappears quickly, proceed to inspection.
• Step 2 – Check filters and indoor airflow: Clean indoor filters and ensure all supply louvers are open. Restricted airflow can cause coil freeze and low suction pressure.
• Step 3 – Look for signs of oil or staining: With power OFF, inspect around flare connections, service valves, and coil joints on both indoor and outdoor units. Oily residue or greenish stains often indicate a refrigerant leak.
• Step 4 – Observe operation: If the unit runs only briefly before E3, and you hear hissing or gurgling, the system may be very low on refrigerant.
• Step 5 – Call a certified HVAC technician: A technician must locate and repair leaks, evacuate the system, and recharge with the correct type and weight of refrigerant specified on the Gree nameplate. They may also test/replace the low-pressure switch if fitted.