H0
Gree Split AC
Severity: ModerateWhat Does This Error Mean?
H0 means the compressor failed to start within the allowed time after receiving the start signal. The AC shuts down to avoid damage from a stalled or struggling compressor. Low supply voltage and a faulty capacitor are common causes to check first.
Affected Models
- Gree FAIRY Series
- Gree LOMO Series
- Gree U-MATCH Series
- Gree PULAR Series
- Gree Inverter Split System
Common Causes
- Faulty or weak start capacitor unable to provide the starting torque the compressor needs
- Low supply voltage preventing the compressor from drawing enough current to start
- Compressor motor damaged and unable to start under load
- Outdoor PCB not sending the correct start signal to the compressor
- Compressor too cold in very low temperatures, making oil too viscous to allow startup
How to Fix It
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Turn the AC off at the circuit breaker and wait 10–15 minutes.
If the compressor attempted to start and failed, its thermal protection may have tripped. A rest period allows it to reset.
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Check the supply voltage if possible. Low voltage (below 200 V) prevents the compressor from starting.
If voltage is low, avoid running the AC until the supply issue is fixed — forced starts on low voltage cause rapid wear.
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If the AC has been off for a long time in cold weather, try starting it on a warmer day first.
In very cold conditions, compressor oil becomes thick and makes starting difficult. Some Gree models have a crankcase heater to prevent this.
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Attempt one careful restart. If H0 returns immediately, switch off and call a technician.
One restart attempt is reasonable. Multiple attempts on a faulty compressor risk burning out the motor windings.
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Call a Gree-qualified technician and mention H0. They will test the capacitor, supply voltage, and compressor.
A capacitor test takes minutes and the part is inexpensive. If the capacitor is fine, the technician will test the compressor directly.
When to Call a Professional
H0 almost always requires a technician to diagnose and repair. Capacitor replacement, compressor testing, and PCB faults all need professional tools. Do not repeatedly restart on H0 — failed start attempts stress the compressor motor.
Frequently Asked Questions
Can H0 be fixed with a capacitor replacement?
Yes — a weak or failed start capacitor is one of the most common causes of H0. Capacitors are inexpensive and a technician can test and replace one in under an hour. This is the first thing a good technician will check.
How do I know if the compressor is the problem rather than the capacitor?
A technician tests the capacitor first — if it tests good, they measure compressor winding resistance. A failed compressor will show incorrect resistance or draw no current when tested. This diagnosis requires a multimeter and knowledge of the correct specification values.
Does H0 appear on new Gree AC installations?
H0 on a new installation usually points to low supply voltage or incorrect wiring. If your new AC shows H0 immediately after installation, call your installer back — it is an installation issue. Incorrect voltage or wiring polarity will prevent the compressor from starting.