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Error code reference

Samsung Air Conditioner Error Code E113

MCU temperature sensor open/short error.

Samsung codesSamsung air conditioner codes

MCU temperature sensor open/short error.

First step from the service manual

Disconnect MCU temperature sensor connector from PCB and measure resistance between 2 terminals.

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

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What E113 means on a Samsung air conditioner

Error code E113 on a Samsung air conditioner indicates a fault detected in the MCU (microcontroller unit) temperature sensor circuit. The MCU temperature sensor monitors the internal operating temperature of the main control board or its processor, allowing the system to protect critical electronics from overheating. When the unit's self-diagnostics detect that the sensor signal is outside of acceptable parameters, it registers an open or short circuit condition and triggers E113 to halt normal operation and flag the fault.

An open circuit condition means the electrical path through the sensor has been broken, resulting in no signal reaching the PCB. A short circuit means two points in the sensor circuit are making unintended contact, collapsing the resistance to near zero. The first diagnostic step is to disconnect the MCU temperature sensor connector from the PCB and measure resistance across the two terminals with a multimeter. A healthy NTC-type temperature sensor will show a specific resistance value at ambient temperature, while an open circuit will read OL (overload/infinite) and a short will read near 0 ohms. Either extreme confirms sensor failure.

Common causes include physical damage to the sensor wiring harness, corrosion at the connector terminals, a failed sensor element itself, or in some cases a damaged PCB input circuit. Because the sensor is monitoring board-level temperature, exposure to moisture or prolonged operation in high-humidity environments can accelerate connector corrosion and lead to intermittent or permanent signal loss.

Source: manufacturer service documentation.

Common causes of E113

  1. 01

    Failed MCU temperature sensor

    Part replacement

    The sensor element itself has failed internally, resulting in either an open or shorted reading when measured across its two terminals. This is the most common cause and is confirmed by an out-of-range resistance reading during the initial connector test.

  2. 02

    Damaged or disconnected sensor wiring harness

    Part replacement

    The wiring between the sensor and the PCB connector may be pinched, frayed, or pulled loose, breaking the circuit. Inspect the full length of the harness and connector pins for visible damage or looseness.

  3. 03

    Corroded or oxidized connector terminals

    Wiring / connection

    Moisture exposure can cause corrosion at the connector pins, increasing resistance or breaking continuity entirely. Look for green or white oxidation at the sensor connector on the PCB side and the sensor side.

  4. 04

    PCB input circuit damage

    Part replacement

    If the sensor and harness both test correctly, the fault may lie in the PCB circuit that reads the sensor signal. A damaged trace, burned component, or failed input on the board can mimic an open or short sensor condition.

See the test procedure for each cause

Frequently asked questions about E113

What does E113 mean on a Samsung air conditioner?
E113 indicates an open or short circuit error in the MCU temperature sensor, which monitors the internal temperature of the main control board. The unit's diagnostics have detected that the sensor signal is either missing (open circuit) or collapsed (short circuit). This fault causes the system to stop normal operation to protect the electronics. A resistance check at the sensor connector is the first step to confirm whether the sensor itself has failed.
Can I fix E113 on my Samsung air conditioner myself?
A knowledgeable DIYer can begin by checking the sensor connector for loose connections or visible corrosion, which sometimes resolves the issue without replacing parts. If the connector appears intact, measuring resistance across the two sensor terminals with a multimeter will tell you whether the sensor has failed. Replacing the MCU temperature sensor is a relatively straightforward repair if you are comfortable working with PCB connectors and low-voltage components. If the PCB itself is damaged, professional repair or board replacement is recommended.
Is it safe to run my air conditioner with an E113 error?
You should not continue running the unit while E113 is active. The MCU temperature sensor protects the control board from overheating, and operating without a functioning sensor removes that protection. Prolonged operation under this condition could result in damage to the PCB or other electronic components. Address the fault before resuming normal use.
How much does it cost to repair an E113 error on a Samsung air conditioner?
If only the MCU temperature sensor needs replacement, parts and labor typically range from around $75 to $200 depending on the unit model and local labor rates. If the main PCB is damaged and requires replacement, costs can range from $150 to $500 or more. Diagnosing the fault accurately before ordering parts will help avoid unnecessary expenses.
Will resetting my Samsung air conditioner clear the E113 error?
A power reset may temporarily clear the error display, but the code will return if the underlying sensor fault is still present. Because E113 is triggered by a measurable electrical condition (open or short circuit in the sensor), the fault will be detected again as soon as the system runs its diagnostics. A permanent resolution requires inspecting, testing, and if necessary replacing the MCU temperature sensor or addressing any wiring issues.

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