Access our premium database of error codes, common faults, and professional repair solutions for Gree / Mace appliances.
Inlet tube sensor malfunction
Component fatigue, sensor feedback out of tolerance, wiring harness connector discontinuity, or electronic control board glitch.
Inspect or replace the inlet tube sensor.
Outlet tube sensor malfunction
Component fatigue, sensor feedback out of tolerance, wiring harness connector discontinuity, or electronic control board glitch.
Inspect or replace outlet tube sensor.
Jumper cap malfunction protection
Defective PCB Power Supply Rails & DC Bus Filter Capacitors, open/short circuit in the wiring harness, or faulty connector on the electronic control board (pcb) & bus communications.
Check the jumper cap on the main PCB board. It may be missing or faulty.
Refrigerant system high pressure protection
Component fatigue, sensor feedback out of tolerance, wiring harness connector discontinuity, or electronic control board glitch.
Check refrigerant levels, ensure outdoor unit has proper airflow. PRO TIP: For communication (E6) and sensor errors, always check the wiring connections between the indoor and outdoor units or sensor harness before replacing parts.
Gree / Mace E2: NTC temperature sensor signal out of range (open or short circuit) in Air Conditioner / Heat Pump.
Defective NTC Temperature Sensor Probe (Thermistor), open/short circuit in the wiring harness, or faulty connector on the ntc temperature sensor & thermistor.
Check indoor air filter, indoor coil temp sensor, and refrigerant charge. PRO TIP: For communication (E6) and sensor errors, always check the wiring connections between the indoor and outdoor units or sensor harness before replacing parts.
Compressor exhaust high temperature protection
Defective NTC Temperature Sensor Probe (Thermistor), open/short circuit in the wiring harness, or faulty connector on the ntc temperature sensor & thermistor.
Check for refrigerant leak, blockage, or faulty exhaust temp sensor. PRO TIP: For communication (E6) and sensor errors, always check the wiring connections between the indoor and outdoor units or sensor harness before replacing parts.
AC over-current protection
Component fatigue, sensor feedback out of tolerance, wiring harness connector discontinuity, or electronic control board glitch.
Check voltage supply and compressor for over-current conditions.
Communication failure between indoor unit and outdoor unit
Component fatigue, sensor feedback out of tolerance, wiring harness connector discontinuity, or electronic control board glitch.
Check wiring/terminal blocks between indoor and outdoor units. PRO TIP: For communication (E6) and sensor errors, always check the wiring connections between the indoor and outdoor units or sensor harness before replacing parts.
Anti-high temperature protection
Component fatigue, sensor feedback out of tolerance, wiring harness connector discontinuity, or electronic control board glitch.
Check system for proper airflow and clean coils.
Loading EEPROM malfunction
Defective PCB Power Supply Rails & DC Bus Filter Capacitors, open/short circuit in the wiring harness, or faulty connector on the electronic control board (pcb) & bus communications.
Main PCB memory error. Board may need replacement.
IPM over temperature limit / drop frequency
Defective 3-Phase Motor Windings / Tacho Generator / Carbon Brushes, open/short circuit in the wiring harness, or faulty connector on the drive motor, inverter & tachometer sensor.
Inverter module too hot, dropping frequency.
Indoor ambient sensor open or short circuit
Defective NTC Temperature Sensor Probe (Thermistor), open/short circuit in the wiring harness, or faulty connector on the ntc temperature sensor & thermistor.
Inspect or replace indoor ambient temperature sensor.
Indoor tube sensor open or short circuit
Defective NTC Temperature Sensor Probe (Thermistor), open/short circuit in the wiring harness, or faulty connector on the ntc temperature sensor & thermistor.
Inspect or replace indoor coil (tube) temperature sensor.
Outdoor ambient sensor open or short circuit
Defective NTC Temperature Sensor Probe (Thermistor), open/short circuit in the wiring harness, or faulty connector on the ntc temperature sensor & thermistor.
Inspect or replace outdoor ambient temperature sensor.
Outdoor tube sensor open or short circuit
Defective NTC Temperature Sensor Probe (Thermistor), open/short circuit in the wiring harness, or faulty connector on the ntc temperature sensor & thermistor.
Inspect or replace outdoor coil (tube) temperature sensor.
Exhaust sensor open or short circuit
Defective NTC Temperature Sensor Probe (Thermistor), open/short circuit in the wiring harness, or faulty connector on the ntc temperature sensor & thermistor.
Inspect or replace compressor exhaust temperature sensor.
Over load limit / drop frequency
Component fatigue, sensor feedback out of tolerance, wiring harness connector discontinuity, or electronic control board glitch.
Check unit for overload conditions or dirty coils.
Over current limit / drop frequency
Component fatigue, sensor feedback out of tolerance, wiring harness connector discontinuity, or electronic control board glitch.
1. Disconnect 230V mains power for 3 minutes. 2. Inspect wire harness and edge connectors on control board for loose pins or oxidation. 3. Inspect mechanical linkages and sensors associated with subsystem. 4. Reset: Power cycle reset: Disconnect appliance from 230V mains for 3 minutes. Press and hold Start/Power for 10 seconds while unplugged, then reconnect power.
High exhaust temperature limit / drop frequency
Debris or foreign object blocking drain pump impeller, open circuit on synchronous pump motor winding, pinched outlet hose, or control PCB triac failure.
Check compressor exhaust conditions and refrigerant level.
Over tube temperature drop frequency
Component fatigue, sensor feedback out of tolerance, wiring harness connector discontinuity, or electronic control board glitch.
Coil temperature too high, system reducing frequency.
Gree / Mace FC: Operational cycle fault detected during Air Conditioner / Heat Pump program execution.
Component fatigue, sensor feedback out of tolerance, wiring harness connector discontinuity, or electronic control board glitch.
1. Disconnect 230V mains power for 3 minutes. 2. Inspect wire harness and edge connectors on control board for loose pins or oxidation. 3. Inspect mechanical linkages and sensors associated with subsystem. 4. Reset: Power cycle reset: Disconnect appliance from 230V mains for 3 minutes. Press and hold Start/Power for 10 seconds while unplugged, then reconnect power.
Compressor overload sensor malfunction
Component fatigue, sensor feedback out of tolerance, wiring harness connector discontinuity, or electronic control board glitch.
Check compressor overload protector and sensor connections.
Anti-freezing limit / drop frequency
Component fatigue, sensor feedback out of tolerance, wiring harness connector discontinuity, or electronic control board glitch.
Indoor coil getting too cold, system reducing frequency to prevent freeze.
Heating anti-high temperature drop frequency
Defective Immersion / Air Heating Element & Klixon Thermostat, open/short circuit in the wiring harness, or faulty connector on the heating element, thermostat & safety fuse.
Unit is dropping frequency to prevent over-temperature in heating mode.
Gree / Mace H1: Operational cycle fault detected during Air Conditioner / Heat Pump program execution.
Component fatigue, sensor feedback out of tolerance, wiring harness connector discontinuity, or electronic control board glitch.
Normal operation. System is in defrost mode. Wait for it to finish.
Static clearing dust protection
Component fatigue, sensor feedback out of tolerance, wiring harness connector discontinuity, or electronic control board glitch.
1. Disconnect 230V mains power for 3 minutes. 2. Inspect wire harness and edge connectors on control board for loose pins or oxidation. 3. Inspect mechanical linkages and sensors associated with subsystem. 4. Reset: Power cycle reset: Disconnect appliance from 230V mains for 3 minutes. Press and hold Start/Power for 10 seconds while unplugged, then reconnect power.
Compressor over load protection
Component fatigue, sensor feedback out of tolerance, wiring harness connector discontinuity, or electronic control board glitch.
Check compressor draw and ensure normal heat dissipation.
System abnormal protection
Component fatigue, sensor feedback out of tolerance, wiring harness connector discontinuity, or electronic control board glitch.
General system error. Restart unit, check all parameters if error returns.
Gree / Mace H5: Motor drive or inverter rotation anomaly in Air Conditioner / Heat Pump; drum/motor fails to spin at target RPM.
Defective 3-Phase Motor Windings / Tacho Generator / Carbon Brushes, open/short circuit in the wiring harness, or faulty connector on the drive motor, inverter & tachometer sensor.
Intelligent Power Module error. Check outdoor inverter board.
No feedback of indoor fan motor
Defective 3-Phase Motor Windings / Tacho Generator / Carbon Brushes, open/short circuit in the wiring harness, or faulty connector on the drive motor, inverter & tachometer sensor.
Check indoor fan motor, wiring harness, and main control board.