Gree Split AC Error Code PH — What It Means & How to Fix It

What Does This Error Mean?

PH means the DC voltage inside the outdoor inverter circuit is too high. This protects the drive board from damage due to mains over-voltage or a voltage spike. Check your mains supply voltage — if it is normal, there may be a faulty capacitor.

Affected Models

Gree FAIRY Series
Gree LOMO Series
Gree U-MATCH Series
Gree PULAR Series
Gree Inverter Split System

Common Causes

Mains supply voltage is abnormally high (above the rated maximum input)
Power surge from the grid entered the outdoor unit
Regenerative voltage spike from the compressor during fast deceleration or stop
DC bus capacitor failing and not smoothing voltage spikes correctly
Faulty outdoor PCB incorrectly measuring or responding to bus voltage

How to Fix It

Turn off the AC and switch off the outdoor circuit breaker.

If PH was caused by a voltage spike, this clears the fault state.
Wait 5 minutes, then check the mains supply voltage at your meter box with a voltmeter.

Voltage consistently above the unit's rated input maximum (usually around 240V +10%) can trigger PH.
If supply voltage is normal, restore power and restart the unit.

A one-time spike from the grid often triggers PH once and clears after a power cycle.
If PH returns immediately on startup, do not continue restarting.

Repeated restarts while the bus voltage is genuinely high can damage the drive board permanently.
Contact a Gree technician if the error recurs — they will test the capacitors and rectifier circuit.

A failing DC bus capacitor is a common and cost-effective repair that resolves most recurring PH errors.

When to Call a Professional

Call a technician if the mains supply voltage is normal but PH persists. DC bus capacitor failure is a common cause and requires a board-level repair. Do not attempt to work on the drive board — it holds lethal DC voltage even after power is removed.

Frequently Asked Questions

What is DC bus voltage in a Gree inverter AC?

The DC bus is the high-voltage DC circuit inside the outdoor unit that powers the inverter drive. It is created by rectifying the mains AC supply. If this voltage goes too high, it can destroy the drive board electronics.

Can a power surge cause a Gree PH error?

Yes — a sudden voltage spike from the grid is one of the most common causes of PH. A one-time PH after a storm or power restoration is usually not a sign of a failing component.

Is it safe to restart my Gree AC after a PH error?

One restart attempt is reasonable if you suspect a one-off voltage spike. If PH returns immediately, stop restarting and get it diagnosed. Repeated high-voltage events can progressively damage the drive board.