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Error code reference

Samsung Air Conditioner Error Code E412

Fixed 1 discharge sensor breakaway.

Samsung codesSamsung air conditioner codes

Fixed 1 discharge sensor breakaway.

First step from the service manual

Check if fixed compressor 1 discharge sensor is separated; reassemble.

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

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What E412 means on a Samsung air conditioner

Error code E412 on a Samsung air conditioner indicates that the discharge temperature sensor for fixed compressor 1 has become physically separated or disconnected from its mounting position. This sensor monitors the temperature of the refrigerant gas as it exits the compressor, which is a critical measurement for protecting the compressor from overheating and ensuring efficient system operation. When the sensor loses contact with the discharge line or its connector, the control board can no longer receive a valid temperature signal and triggers E412 to halt operation and prevent potential compressor damage.

The discharge sensor on a fixed-speed compressor is typically a thermistor-type sensor secured to the compressor discharge pipe with a clamp, bracket, or friction-fit sleeve. Physical separation can occur due to vibration over time, improper reinstallation after prior servicing, or a failed retaining clip. Unlike a sensor failure caused by an open or short circuit, E412 specifically points to a physical displacement of the sensor rather than an electrical fault in the sensor itself.

The first diagnostic step is to visually inspect the discharge sensor on compressor 1 to confirm it has pulled away from its designated contact point on the discharge line. If the sensor body is found loose or detached, repositioning it correctly and securing the retaining hardware will typically resolve the fault. After reassembly, the error code should clear once the control board receives a stable temperature reading within the expected operating range.

Source: manufacturer service documentation.

Common causes of E412

  1. 01

    Sensor physically dislodged from discharge pipe

    Wiring / connection

    The most direct cause of E412 is the thermistor sensor pulling free from its clamp or mounting sleeve on the compressor discharge line. Inspect the discharge pipe of compressor 1 for a loose or dangling sensor body.

  2. 02

    Failed or broken retaining clip

    Part replacement

    The clip or bracket that holds the sensor against the discharge pipe may have cracked or fatigued from vibration and heat cycling. If the clip is broken, a replacement retaining clip or clamp will be needed to secure the sensor properly.

  3. 03

    Improper reassembly after prior service

    Wiring / connection

    If the unit was recently serviced for refrigerant work or compressor maintenance, the sensor may not have been reseated correctly. Check that the sensor tip is making full contact with the discharge pipe surface and that any securing hardware is tight.

  4. 04

    Excessive compressor vibration loosening the sensor

    Wiring / connection

    Abnormal vibration from a compressor operating under high load or with worn mounts can gradually work a sensor free over time. If the sensor has separated repeatedly, inspect the compressor mounting and vibration isolation.

  5. 05

    Damaged sensor wire harness connector

    Wiring / connection

    In some cases the sensor connector at the control board or along the wire harness may have worked loose in addition to the sensor itself. After reseating the sensor, confirm the wiring connector is fully seated and undamaged.

See the test procedure for each cause

Frequently asked questions about E412

What does E412 mean on a Samsung air conditioner?
E412 means the discharge temperature sensor for fixed compressor 1 has physically separated from its mounting position on the discharge pipe. This sensor is responsible for monitoring heat levels at the compressor outlet. Because the control board can no longer read a valid temperature, it stops operation and displays E412 to protect the compressor from running unmonitored.
How do I fix error code E412 on my Samsung air conditioner?
Start by locating the discharge sensor on compressor 1, which is typically clipped or clamped to the high-pressure discharge line exiting the compressor. If the sensor is found loose or detached, reseat it so the sensing tip makes firm contact with the pipe and secure any retaining hardware. Restart the unit after reassembly to confirm the error clears.
Is it safe to run my Samsung air conditioner while E412 is displayed?
No, you should not continue operating the unit while E412 is active. The discharge temperature sensor protects compressor 1 from overheating, and without a valid sensor reading the system cannot detect dangerously high discharge temperatures. Running the compressor in this condition risks serious and costly compressor damage.
Will resetting my Samsung air conditioner clear the E412 error?
A simple power reset will not permanently clear E412 if the discharge sensor is still separated. The error will return as soon as the control board checks for a valid sensor signal. The sensor must be physically repositioned and secured before the fault will stay cleared after a restart.
How much does it cost to repair a Samsung air conditioner showing E412?
If the sensor only needs to be reseated, the repair cost is primarily the service call fee, which typically ranges from $75 to $150 depending on your region and technician. If the retaining hardware or the sensor itself is damaged and requires replacement, parts costs are generally low, but total repair costs including labor could range from $100 to $300. Compressor-related repairs that stem from delayed attention to E412 can cost significantly more.

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