Gree / Mace E3

Gree / Mace error code E3 indicates: Gree-Mace G10 Inverter / Free Match / GMV5 / GMV6 Multi-VRF Commercial & Residential HVAC: Diagnostic fault code E3 registered by the microcomputer controller. Refrigerant low-pressure protection switch cut-out tripped (< 0.05 MPa).

The primary root cause for Gree / Mace code E3 is: On Gree-Mace appliances engineered with Gree G10 Inverter low-frequency torque control, intelligent dual-stage rotary compressor, 46 Ω electronic expansion valve stepping motor coils, high-voltage PFC boost circuit (380V DC), and precision NTC thermistors (15 kΩ ambient, 20 kΩ coil, 50 kΩ discharge): refrigerant low-pressure switch cut-out (< 0.05 MPa / 0.5 bar) due to severe system charge loss or closed service valve Metrological tolerance verification: low pressure switch normally closed (< 1.0 Ω); trips below 0.05 MPa..

To resolve error code E3: Disconnect mains power before servicing. Unplug the harness at the main PCB and use a calibrated digital multimeter: measure continuity across LP switch terminals and attach digital manifold gauges to verify suction pressure. Inspect contacts for pin oxidation or loose terminals. Replace defective part if out of tolerance, re-energize and clear error: Using the remote controller: point at the unit and press 'LIGHT' 6 times in 3 seconds (or hold 'TURBO' + 'MODE' for 5 seconds) to enter diagnostic query mode. For inverter lockout errors (H5, HC, P0, P8, E6), switch off the external electrical isolator / circuit breaker for at least 3 minutes to allow DC bus capacitors to fully discharge.

Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Gree / Mace code E3 persists, the physical component causing On Gree-Mace appliances engineered with Gree G10 Inverter low-frequency torque control, intelligent dual-stage rotary compressor, 46 Ω electronic expansion valve stepping motor coils, high-voltage PFC boost circuit (380V DC), and precision NTC thermistors (15 kΩ ambient, 20 kΩ coil, 50 kΩ discharge): refrigerant low-pressure switch cut-out (< 0.05 MPa / 0.5 bar) due to severe system charge loss or closed service valve Metrological tolerance verification: low pressure switch normally closed (< 1.0 Ω); trips below 0.05 MPa. must be inspected or replaced.

Set a digital multimeter to ohms (Ω). Disconnect power and test NTC Temperature Sensor Probe (Thermistor) across Across sensor pins 1-2 (unplugged harness). Expected nominal reading is 4.8kΩ–12kΩ (at 20°C–25°C). Tolerance: Negative temperature coefficient: resistance drops smoothly when warmed with fingers. OL = open circuit..

Standard electrical safety protocol: 1. Disconnect 230V mains power before opening panels. 2. Verify zero voltage at test points. 3. Allow hot water or heating elements to cool below 30°C before handling.