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Error code reference

Samsung Air Conditioner Error Code YEL_FLICKER_RED_ON_GRN_ON

Compressor rotation error

Samsung codesSamsung air conditioner codes

Compressor rotation error

First step from the service manual

Check compressor TAB terminal connections and wire connectors to control box

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

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What YEL_FLICKER_RED_ON_GRN_ON means on a Samsung air conditioner

The YEL_FLICKER_RED_ON_GRN_ON error code on a Samsung air conditioner indicates a compressor rotation error. This fault means the control board has detected that the compressor is not spinning correctly, or in some cases not spinning at all, despite receiving a start command. The compressor is the heart of the refrigeration circuit, and proper rotation is essential for building the pressure differential that drives refrigerant through the system. When the control board cannot confirm correct compressor operation, it throws this fault to prevent damage to the motor windings or other system components.

The first diagnostic step specified for this code is to inspect the compressor TAB terminal connections and the wire connectors running between the compressor and the control box. Loose, corroded, or damaged terminals at the compressor TAB block are a frequent root cause of rotation faults because poor electrical contact can prevent the compressor motor from receiving a clean, full-voltage start signal. The control board monitors current draw and rotational feedback, so any interruption in the wiring path will register as a rotation failure even if the compressor itself is mechanically sound.

Beyond wiring issues, a seized or mechanically failed compressor can also trigger this code, as can a faulty control board that is not delivering the correct output signal to drive the compressor. Technicians should work through the wiring and connections first before condemning the compressor or board, since connection faults are far more common and far less costly to repair.

Source: manufacturer service documentation.

Common causes of YEL_FLICKER_RED_ON_GRN_ON

  1. 01

    Loose or corroded TAB terminal connections

    Wiring / connection

    The compressor TAB terminal block is the first place to check. Loose pins or corrosion at these terminals can interrupt the start signal and prevent proper rotation.

  2. 02

    Damaged or disconnected wire connectors to control box

    Wiring / connection

    Wiring between the compressor and the control box can become loose, chafed, or disconnected over time. Inspect the full wire run for breaks, melted insulation, or unseated connector plugs.

  3. 03

    Seized or mechanically failed compressor

    Part replacement

    If the compressor motor windings are shorted or the mechanical components have seized, the unit will fault on startup. This can be identified by checking winding resistance and listening for a locked rotor hum.

  4. 04

    Faulty control board

    Part replacement

    A defective control board may fail to deliver the correct drive signal to start the compressor, causing a rotation fault even when the compressor and wiring are in good condition.

  5. 05

    Low supply voltage

    Wiring / connection

    Insufficient voltage at the unit can prevent the compressor from achieving proper rotation on startup. Verify that incoming voltage matches the unit's rated supply specifications.

See the test procedure for each cause

Frequently asked questions about YEL_FLICKER_RED_ON_GRN_ON

What does YEL_FLICKER_RED_ON_GRN_ON mean on a Samsung air conditioner?
This code indicates a compressor rotation error, meaning the control board detected that the compressor is not spinning correctly after receiving a start command. The LED pattern (yellow flickering, red on, green on) is how the Samsung unit signals this specific fault. The first step is to inspect the compressor TAB terminal connections and the wire connectors leading to the control box.
Can I fix a YEL_FLICKER_RED_ON_GRN_ON error myself?
A homeowner can safely inspect visible wire connectors for obvious looseness or damage, but diagnosing and repairing the compressor, control board, or internal wiring typically requires a trained HVAC technician. Working around high-voltage components and refrigerant systems carries significant safety risks. If the issue is simply a loose connector, reseating it may resolve the fault, but further diagnosis should be left to a professional.
Is it safe to keep running my Samsung air conditioner when this error appears?
No. When this fault is active, the system has already shut down the compressor to prevent damage. Attempting to force the unit to run without resolving the underlying issue can damage the compressor motor windings or other electrical components. The unit should remain off until the fault is diagnosed and repaired.
Will resetting the unit clear the YEL_FLICKER_RED_ON_GRN_ON error?
A power reset may temporarily clear the fault display, but the error will return if the root cause has not been corrected. Because this fault points to a real mechanical or electrical condition, resetting without repair is not a lasting solution and could allow further damage to occur.
How much does it cost to repair a compressor rotation error on a Samsung air conditioner?
Repair costs vary widely depending on the root cause. Fixing a loose or corroded terminal connection is typically inexpensive, often in the range of a standard service call fee of $75 to $150. Replacing a control board generally costs between $200 and $500 including parts and labor. A failed compressor is the most expensive outcome, with replacement costs commonly ranging from $600 to $1,500 or more depending on unit size and refrigerant type.

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