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Error code reference

Samsung Air Conditioner Error Code G2

Full leakage of refrigerant or compressor loading defect detected.

Samsung codesSamsung air conditioner codes

Full leakage of refrigerant or compressor loading defect detected.

First step from the service manual

Check compressor operating current with hook meter; check PWM OPEN and refrigerant pressure.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What G2 means on a Samsung air conditioner

The Samsung G2 error code signals that the air conditioner's control board has detected either a full refrigerant leak or a compressor loading defect. These two conditions are grouped under the same fault code because both produce similar abnormal current signatures at the compressor. The inverter drive board continuously monitors compressor operating current and PWM (pulse-width modulation) output signals. When the compressor draws current outside its expected range, or when the PWM control signal indicates an open circuit condition, the system interprets this as either a loss of refrigerant charge or a mechanical loading problem inside the compressor itself.

A full refrigerant leak eliminates the pressure differential the compressor relies on to build load. With no refrigerant to compress, the compressor runs in an unloaded state and its current draw drops significantly below normal operating parameters. This abnormal low-current condition triggers G2. Conversely, a compressor loading defect, such as a seized scroll assembly or failed internal components, can produce erratic or out-of-range current readings even when refrigerant charge is present. The PWM OPEN condition refers to a fault in the drive signal between the inverter board and compressor, which must also be ruled out during diagnosis.

Diagnosis begins with a clamp-style hook meter to measure actual compressor operating current and compare it against rated specifications. Refrigerant pressure readings at both the high and low side service ports are essential to confirm whether charge is present. If pressure is confirmed normal but current is abnormal, the focus shifts to the compressor itself and the inverter drive circuit.

Source: manufacturer service documentation.

Common causes of G2

  1. 01

    Complete refrigerant loss

    Part replacement

    A full leak of refrigerant eliminates system pressure, causing the compressor to run unloaded with abnormally low current draw. Low-side and high-side pressure gauge readings near zero confirm this condition.

  2. 02

    Compressor mechanical loading defect

    Part replacement

    Internal compressor failure, such as a seized scroll set or worn mechanical components, produces erratic or out-of-range current readings even with refrigerant present. Hook meter readings outside rated operating current point to this cause.

  3. 03

    PWM signal open circuit fault

    Wiring / connection

    An open circuit in the PWM control signal between the inverter board and the compressor prevents proper drive commands from reaching the compressor. Inspecting the wiring harness and connector between the inverter board and compressor can identify this fault.

  4. 04

    Refrigerant leak at a fitting or coil

    Part replacement

    A slow or partial leak that has progressed to near-complete loss of charge can trigger G2. UV dye testing or electronic leak detection around service fittings, coil joints, and line set connections will locate the source.

  5. 05

    Inverter drive board failure

    Part replacement

    A faulty inverter board may send incorrect or absent PWM signals, mimicking a compressor loading defect. If wiring checks out and compressor resistance tests are normal, the inverter board itself should be evaluated.

See the test procedure for each cause

Frequently asked questions about G2

What does G2 mean on a Samsung air conditioner?
The G2 code on a Samsung air conditioner indicates that the system has detected either a full refrigerant leak or a compressor loading defect. The control board monitors compressor operating current and PWM drive signals, and triggers this code when readings fall outside acceptable parameters. Both a loss of refrigerant charge and an internal compressor failure can produce similar abnormal current signatures, which is why both conditions share this fault code.
Can I fix a Samsung G2 error code myself?
Most of the root causes behind G2 require professional tools and certifications to address properly. Refrigerant handling requires EPA 608 certification in the United States, and measuring compressor operating current accurately requires a hook meter and knowledge of the rated specifications. A technician should perform pressure testing, current measurement, and PWM signal checks before any repair attempt. DIY action is generally limited to visual inspection of wiring and connectors.
Is it safe to run my Samsung air conditioner with a G2 error?
Running the unit continuously with a G2 error is not recommended. If the compressor is operating without adequate refrigerant, it can overheat and suffer permanent internal damage. If a mechanical loading defect is present, continued operation can worsen the failure and increase repair costs significantly. The safest approach is to shut the unit off and have it diagnosed before resuming use.
How much does it cost to repair a Samsung G2 error?
Repair costs vary widely depending on the root cause. A refrigerant recharge following a leak repair typically ranges from $200 to $600 or more depending on refrigerant type and labor. Compressor replacement is considerably more expensive, often falling in the range of $600 to $1,500 or higher for parts and labor. Inverter board replacement generally falls between $200 and $500. A proper diagnosis is needed before any cost estimate can be made.
Will resetting my Samsung air conditioner clear the G2 error?
A power reset may temporarily clear the G2 code from the display, but the fault will return if the underlying problem is not resolved. The control board will continue to monitor compressor current and PWM signals, and will re-trigger the code as soon as it detects the same out-of-range condition. Resetting without repair does not address the refrigerant loss or compressor defect causing the fault.

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