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Error code reference

Samsung Air Conditioner Error Code YEL_ON_RED_ON_GRN_FLICKER

Deice sensor error (open/short)

Samsung codesSamsung air conditioner codes

Deice sensor error (open/short)

First step from the service manual

Check deice temperature sensor at CN52 PIN#3,4

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

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What YEL_ON_RED_ON_GRN_FLICKER means on a Samsung air conditioner

The YEL_ON_RED_ON_GRN_FLICKER error code on a Samsung air conditioner indicates a deice sensor fault, specifically an open circuit or short circuit condition in the deice temperature sensor. The deice sensor monitors the temperature of the evaporator coil to detect ice buildup and trigger defrost cycles as needed. When the unit's control board cannot read a valid signal from this sensor, it displays this LED indicator pattern and halts normal operation to prevent equipment damage.

The first diagnostic step is to inspect the deice temperature sensor at connector CN52, pins 3 and 4. An open circuit fault typically results from a broken wire, a disconnected connector, or a failed sensor element with readings outside the expected resistance range. A short circuit fault points to damaged wiring insulation, moisture intrusion causing a ground fault, or an internally shorted sensor. Both conditions produce an invalid signal at the control board input, triggering this error.

Diagnosis involves disconnecting the sensor from CN52 and measuring resistance across the sensor leads with a multimeter. A reading of infinite resistance confirms an open circuit, while a reading near zero ohms confirms a short. Wiring between the sensor and the connector should also be inspected for pinches, chafing, or corrosion. If the sensor element tests out of specification or the wiring is damaged, replacement of the sensor or the affected wiring harness is required to clear the fault.

Source: manufacturer service documentation.

Common causes of YEL_ON_RED_ON_GRN_FLICKER

  1. 01

    Failed deice temperature sensor

    Part replacement

    The sensor element itself has failed, producing either an open or short circuit. Testing resistance across the sensor leads at CN52 pins 3 and 4 will confirm if the sensor is out of range.

  2. 02

    Disconnected or loose connector at CN52

    Wiring / connection

    The sensor connector at CN52 may have vibrated loose or was not fully seated, causing an open circuit fault. Inspect and firmly reseat the connector at pins 3 and 4.

  3. 03

    Damaged sensor wiring or harness

    Part replacement

    Wiring between the deice sensor and CN52 may be pinched, chafed, or corroded, causing an intermittent or permanent open or short circuit. Visually trace the wiring and check continuity.

  4. 04

    Moisture or corrosion at the connector

    Wiring / connection

    Water intrusion at the CN52 connector can corrode the pin contacts or create a short circuit path between pins. Inspect the connector for discoloration, oxidation, or moisture and clean or replace as needed.

  5. 05

    Control board input fault

    Part replacement

    If the sensor and wiring both test correctly, the sensor input circuit on the control board may have failed, preventing accurate signal reading. This is less common but should be evaluated after ruling out sensor and wiring issues.

See the test procedure for each cause

Frequently asked questions about YEL_ON_RED_ON_GRN_FLICKER

What does YEL_ON_RED_ON_GRN_FLICKER mean on a Samsung air conditioner?
This LED indicator pattern signals a deice sensor error, meaning the control board has detected either an open circuit or a short circuit in the deice temperature sensor. The deice sensor monitors the evaporator coil for ice buildup and is a critical part of the defrost system. The unit will not operate normally until the sensor fault is resolved. Diagnosis begins at connector CN52, pins 3 and 4, where the sensor connects to the control board.
Can I fix the YEL_ON_RED_ON_GRN_FLICKER error myself?
A knowledgeable DIYer can perform basic checks such as reseating the connector at CN52 and inspecting the wiring for visible damage. Testing the sensor resistance with a multimeter is also within reach if you are comfortable with electrical diagnostics. However, if the sensor or wiring harness needs replacement, or if the control board is involved, professional service is recommended to ensure correct parts and safe handling of refrigerant components nearby.
Is it safe to keep running my Samsung air conditioner with this error code?
No, you should not continue running the unit with this error active. The deice sensor is part of the defrost protection system, and without accurate sensor data, the evaporator coil could develop excessive ice buildup that restricts airflow and can cause compressor damage. The unit may already be locked out of normal operation as a protective measure. Power down the system and address the sensor fault before resuming use.
How much does it cost to repair a deice sensor error on a Samsung air conditioner?
If only the connector needs reseating or minor wiring repair is required, costs are minimal, covering only a service call fee typically in the range of $75 to $150. Replacing the deice temperature sensor itself generally costs between $50 and $150 for the part plus labor. If the control board is the root cause, repair costs can range from $200 to $600 or more depending on the model and labor rates in your area.
Will resetting my Samsung air conditioner clear the YEL_ON_RED_ON_GRN_FLICKER error?
A power reset may temporarily clear the error display, but the code will return if the underlying sensor fault is still present. Because this error reflects an actual electrical fault, either an open or a short circuit in the deice sensor circuit, resetting without repairing the root cause will not resolve the problem. The fault at CN52 pins 3 and 4 must be diagnosed and corrected for the error to clear permanently.

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