Field Actions
DISPATCHAlways disconnect appliance from 230V/400V mains before opening panels. Use CAT III multimeter for circuit testing.
Frequently Asked Questions: Gree / Mace D4
FAQ TREEWhat does error code D4 mean on a Gree / Mace appliance?
Gree / Mace error code D4 indicates: Gree-Mace Versati II / Versati III / Versati IV Air-to-Water Thermodynamic Heat Pump: Diagnostic fault code d4 registered by the microcomputer controller. Wilo variable-speed circulation pump PWM control feedback signal lost.
What is the root cause of Gree / Mace error code D4?
The primary root cause for Gree / Mace code D4 is: On Gree-Mace appliances engineered with Gree Versati inverter hydronic module, Wilo PWM inverter water circulation pump, brazed plate heat exchanger, differential hydraulic flow switch (contact < 1 Ω), and 50 kΩ compressor discharge NTC sensor: Wilo variable-speed circulation pump PWM control feedback signal lost Metrological tolerance verification: PWM control line 0-10V DC / 100 Hz square wave; feedback signal active..
How do I fix or resolve Gree / Mace error code D4?
To resolve error code D4: Disconnect mains power before servicing. Unplug the harness at the main PCB and use a calibrated digital multimeter: measure PWM control signal from hydrobox to pump and test pump internal electronics. Inspect contacts for pin oxidation or loose terminals. Replace defective part if out of tolerance, re-energize and clear error: On the wired master touch controller: tap Menu -> User Setup -> Troubleshooting -> Clear Fault Record, enter password '0000' or hold 'ON/OFF' + 'CONFIRM' for 5 seconds. Switch off mains power to both outdoor unit and indoor hydrobox for 60 seconds to reset communication and safety relays.
Is it safe to clear Gree / Mace error code D4 by resetting power?
Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Gree / Mace code D4 persists, the physical component causing On Gree-Mace appliances engineered with Gree Versati inverter hydronic module, Wilo PWM inverter water circulation pump, brazed plate heat exchanger, differential hydraulic flow switch (contact < 1 Ω), and 50 kΩ compressor discharge NTC sensor: Wilo variable-speed circulation pump PWM control feedback signal lost Metrological tolerance verification: PWM control line 0-10V DC / 100 Hz square wave; feedback signal active. must be inspected or replaced.
How do I test electrical resistance for Gree / Mace code D4 using a multimeter?
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..
What safety protocol must be followed before servicing Gree / Mace code D4?
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.
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