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Error code reference

Samsung Air Conditioner Error Code *C

Wired remote controller to indoor unit communication error (first digit is indoor unit address).

Samsung codesSamsung air conditioner codes

Wired remote controller to indoor unit communication error (first digit is indoor unit address).

First step from the service manual

Check wired remote controller communication cable and indoor unit main/sub PCB.

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

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What *C means on a Samsung air conditioner

The *C error code on a Samsung air conditioner indicates a communication failure between the wired remote controller and the indoor unit. The asterisk in the code represents the indoor unit's address number, so the first digit you see tells you exactly which indoor unit is experiencing the communication breakdown. This is a signal-level fault, meaning the control signals transmitted over the communication cable between the remote controller and the indoor unit's PCB are not being received or interpreted correctly.

The communication pathway involved runs from the wired remote controller through a dedicated communication cable to the indoor unit's main PCB or sub PCB. This data link carries command signals and status feedback between the controller and the unit. If the cable is damaged, has a poor connection at either terminal block, or has been incorrectly wired, the communication handshake between the two devices will fail and the *C code will appear. Faulty PCBs on either the remote controller side or the indoor unit side can also disrupt this communication.

Common root causes include physical damage to the communication cable, loose or corroded terminal connections, improper wiring during installation, and failed components on the indoor unit main PCB or sub PCB. In multi-unit systems, address configuration conflicts can also interfere with communication. Diagnosing this error requires a systematic check of the cable continuity, terminal integrity, and ultimately the PCB components if the wiring checks out.

Source: manufacturer service documentation.

Common causes of *C

  1. 01

    Damaged or disconnected communication cable

    Wiring / connection

    The cable running between the wired remote controller and the indoor unit may be cut, pinched, or disconnected at one of the terminal blocks. Inspect the full cable run and check that all terminals are seated firmly and free of corrosion.

  2. 02

    Loose terminal connections at the indoor unit or controller

    Wiring / connection

    Vibration or improper installation can cause the communication cable wires to work loose from their terminals. Check the terminal block at both the wired remote controller end and the indoor unit end for loose or improperly seated wires.

  3. 03

    Faulty indoor unit main PCB or sub PCB

    Part replacement

    If the communication cable and its connections are intact, the indoor unit's main or sub PCB may have failed and can no longer process the incoming communication signals. Board failure can result from power surges, moisture intrusion, or component age.

  4. 04

    Faulty wired remote controller

    Part replacement

    The wired remote controller itself may have an internal failure preventing it from transmitting signals correctly. If swapping the controller with a known-good unit resolves the error, the original controller requires replacement.

  5. 05

    Indoor unit address configuration conflict

    Wiring / connection

    In multi-unit installations, an incorrect or duplicate indoor unit address setting can cause communication errors. Verify that the address assigned to the indoor unit matches what the wired remote controller is configured to communicate with.

See the test procedure for each cause

Frequently asked questions about *C

What does *C mean on a Samsung air conditioner?
The *C code on a Samsung air conditioner signals a communication error between the wired remote controller and the indoor unit. The first digit, which replaces the asterisk, identifies the specific indoor unit address that is experiencing the fault. This error means the controller and indoor unit can no longer exchange signals properly, so the system cannot operate normally. The most common causes are a damaged communication cable or a loose wiring connection at one of the terminal blocks.
Can I fix the *C error on my Samsung air conditioner myself?
Some causes of the *C error, such as a loose terminal connection, are accessible to a knowledgeable DIYer who is comfortable working with low-voltage wiring. You can inspect the communication cable for visible damage and check that all wires are firmly secured at both the remote controller and the indoor unit terminal blocks. However, if the problem involves a faulty main PCB or sub PCB inside the indoor unit, that repair should be handled by a qualified technician. Incorrect PCB handling or wiring can cause additional damage.
Is it safe to run my Samsung air conditioner while the *C error is displayed?
When the *C error is active, the wired remote controller cannot reliably communicate with the indoor unit, which means you may not be able to control the unit or verify it is operating within safe parameters. It is best to avoid continued use until the fault is diagnosed and resolved. Attempting to run the system without a functioning control link can lead to unmonitored operation.
How much does it cost to repair the *C error on a Samsung air conditioner?
Repair costs depend on the root cause. If the fix involves reseating a loose wire or replacing a communication cable, costs are typically in the range of 50 to 150 dollars for a service call and labor. If a main PCB or sub PCB replacement is required, parts and labor combined can range from 200 to 600 dollars or more depending on the unit model and local labor rates. A technician will need to diagnose the specific cause before providing an accurate estimate.
Will resetting my Samsung air conditioner clear the *C error code?
A power reset may temporarily clear the *C error, but the code will return if the underlying cause has not been fixed. Resetting the unit does not repair a damaged cable, a loose connection, or a failed PCB. If the error reappears after a reset, the system requires a proper diagnostic inspection of the communication cable and the indoor unit PCBs before the fault can be permanently resolved.

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