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Heat pumps · Error codes · Gree
PLGree

PL on a Gree heat pump: Under-voltage DC bus or voltage drop error

Short answer

On a Gree heat pump, PL means: Under-voltage DC bus or voltage drop error. The heat pump stops until the fault clears or is reset. An engineer is needed to fix the cause. The wording differs by model range — each is shown below.

Reviewed 23 September 2026 · 6 sources

What it means

On the Versati II (R410A)

The manual says: Under-voltage DC bus or voltage drop error.

Part involved: compressor, inverter/driver PCB, power supply.

On the Versati III Monobloc (R32)

The manual says: Under-voltage DC bus or voltage drop error.

Part involved: compressor, inverter/driver PCB, power supply.

On the Versati III Split / All-in-one (R32)

The manual says: DC bus under-voltage or voltage drop error.

Part involved: compressor, inverter/driver PCB, power supply.

On the Versati IV Monobloc (R32)

The manual says: Under-voltage protection.

Part involved: compressor, inverter/driver PCB, power supply.

On the Versati IV Split / All-in-one (R32)

The manual says: DC bus under-voltage or voltage drop error.

Part involved: compressor, inverter/driver PCB, power supply.

On the Versati V R290 Monobloc

The manual says: DC bus under-voltage or voltage drop error.

Part involved: compressor, inverter/driver PCB, power supply.

Is it safe?

Switch the heat pump off at its isolator and call an engineer.

Does the heat pump stop?Yes
Engineer needed?Yes

The heat pump stops until the fault clears or is reset.

Resetting itself: unknown.

What you can check

  • Note the code shown on the controller and the unit model numbers (on the rating plate label) before contacting your installer.
  • Check the heat pump's breaker/isolator at the consumer unit is on; do not open any casing.
  • If the breaker or RCD trips repeatedly, leave the heat pump switched off and call an engineer; do not keep resetting it.

What the engineer will check

  • Follow the Gree troubleshooting flowchart for this code in the service manual.
  • Check supply voltage and phase balance.
  • Check compressor windings and inverter/driver PCB per flowchart.
  • Check heat-sink cooling and connections.

Who to ask for: Heat pump engineer.

Certification: Heat pump installer competence; F-gas / flammable-refrigerant (R290/R32) handling competence for any refrigerant-circuit work.

What you might notice

Sources

A code explains what the controller detected, not a confirmed root cause.

Reviewed: 23 September 2026