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Error code reference

Samsung Air Conditioner Error Code RED_ON_GRN_ON

Compressor peak current (overcurrent) protection

Samsung codesSamsung air conditioner codes

Compressor peak current (overcurrent) protection

First step from the service manual

Check installation ventilation, refrigerant charge, compressor condition

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

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What RED_ON_GRN_ON means on a Samsung air conditioner

The RED_ON_GRN_ON error code on a Samsung air conditioner signals compressor peak current (overcurrent) protection has been triggered. This protection circuit monitors the electrical current drawn by the compressor motor and intervenes when that current exceeds a safe operating threshold. When overcurrent is detected, the system shuts down the compressor to prevent motor winding damage, capacitor failure, or broader electrical faults within the refrigerant circuit.

The most common root causes fall into three categories: mechanical load issues, refrigerant system problems, and installation deficiencies. A compressor working against abnormally high head pressure, often caused by an overcharged or undercharged refrigerant system, will draw excessive current. Similarly, restricted airflow around the outdoor unit forces the compressor to work harder to reject heat, pushing current draw above the protection threshold. Blocked condenser coils, inadequate clearance around the unit, or a failed condenser fan motor are frequent contributors.

Compressor condition itself must also be evaluated. A compressor with degraded motor windings, a seized bearing, or internal valve failure will pull high current even under otherwise normal operating conditions. Technicians should measure compressor winding resistance and supply voltage, verify refrigerant pressures with a manifold gauge set, and confirm the installation site provides adequate ventilation clearance per the unit's specifications before assuming the compressor requires replacement.

Source: manufacturer service documentation.

Common causes of RED_ON_GRN_ON

  1. 01

    Restricted airflow at the outdoor unit

    Wiring / connection

    Blocked condenser coils, debris accumulation, or insufficient clearance around the outdoor unit raises head pressure and forces the compressor to draw excess current. Inspect the condenser coil and surrounding area for obstructions and verify minimum clearance requirements are met.

  2. 02

    Incorrect refrigerant charge

    Wiring / connection

    Both overcharge and undercharge conditions can cause abnormal operating pressures that increase compressor load and current draw. A manifold gauge set is required to verify suction and discharge pressures against the unit's rated operating range.

  3. 03

    Failed or degraded compressor

    Part replacement

    Worn motor windings, a seized bearing, or internal valve failure causes the compressor to draw high current even under normal system conditions. Winding resistance should be measured at the compressor terminals and compared to specification.

  4. 04

    Condenser fan motor failure

    Part replacement

    A failed or underperforming condenser fan reduces heat rejection from the outdoor coil, causing discharge pressure and compressor current to rise. Verify the fan motor runs at the correct speed and draws appropriate current.

  5. 05

    Low or unstable supply voltage

    Wiring / connection

    When supply voltage is lower than the unit's rated input range, the compressor motor compensates by drawing higher current to maintain torque, which can trigger overcurrent protection. Measure voltage at the disconnect under operating load to identify voltage sag.

See the test procedure for each cause

Frequently asked questions about RED_ON_GRN_ON

What does RED_ON_GRN_ON mean on a Samsung air conditioner?
RED_ON_GRN_ON indicates the compressor peak current protection circuit has activated, meaning the compressor was drawing more electrical current than the safe operating limit allows. The system shuts down the compressor automatically to prevent motor or component damage. This fault requires diagnosis of airflow, refrigerant charge, and compressor condition before the unit can safely return to operation.
Can I fix the RED_ON_GRN_ON error myself?
Some contributing factors, such as clearing debris from around the outdoor unit or improving ventilation clearance, can be addressed by a homeowner. However, checking refrigerant pressures, measuring compressor winding resistance, and diagnosing electrical faults requires certified HVAC technician tools and, in the case of refrigerant work, EPA 608 certification. Attempting refrigerant or compressor repairs without proper training can be dangerous and may void your warranty.
Is it safe to keep running my Samsung air conditioner when this error appears?
No. The overcurrent protection is designed to prevent serious damage, and repeatedly attempting to run the unit while the underlying cause is unresolved risks burning out the compressor motor or causing electrical faults. The system should remain off until a technician has diagnosed and corrected the problem.
Will resetting the air conditioner clear the RED_ON_GRN_ON error?
A power reset may clear the fault code temporarily and allow the unit to restart, but if the root cause has not been corrected, the overcurrent protection will trigger again. Repeated resets without addressing the underlying issue can accelerate compressor wear. A reset should only be performed after the contributing condition has been identified and resolved.
How much does it cost to repair a Samsung air conditioner showing this error?
Repair costs vary widely depending on the cause. Cleaning the condenser coil and improving ventilation is relatively inexpensive, typically in the range of $75 to $200 for a service call. Refrigerant adjustment or leak repair can range from $150 to $500 or more depending on the refrigerant type and amount needed. Compressor replacement is the most expensive outcome, generally ranging from $600 to $1,500 or higher depending on the unit size and labor rates in your area.

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