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Error code reference

Samsung Air Conditioner Error Code Ux

EEPROM option error on indoor unit (x = indoor unit address 0-F).

Samsung codesSamsung air conditioner codes
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What the Ux error code actually means

Your Samsung air conditioner is displaying this error because one of the indoor units has a memory chip that isn't working correctly. This chip stores important settings for the unit, and when those settings can't be read properly, the system shuts down to prevent incorrect operation. A technician will likely need to inspect or replace the circuit board inside the affected indoor unit to fix this issue.

Diagnostic procedure

The full Ux procedure

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1
Confirm the fault
Power cycle the unit: switch off the breaker for 60 seconds, then restore power. If the code returns, the fault is persistent and the procedure below isolates the cause.
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Most common causes of Ux

Ranked by how often they cause this code
  1. 1Corrupted EEPROM data
  2. 2Failed EEPROM chip on main PCB
  3. 3Power surge damage to indoor unit PCB
  4. 4Incorrect or lost indoor unit address configuration
  5. 5Moisture or contamination on the control board

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Questions people ask about Ux

What does Ux mean on a Samsung air_conditioner?
The Ux error code indicates an EEPROM option error on one of the indoor units in the system. The "x" character represents the specific indoor unit's address, which ranges from 0 to F. The EEPROM is a memory chip on the indoor unit's control board that stores configuration and addressing data. When that data cannot be read or verified correctly, this error is triggered.
Will resetting the unit clear the Ux error code?
A power reset can clear the Ux error if the EEPROM corruption was caused by a transient event such as a brief power interruption. However, if the EEPROM chip has physically failed or the control board is damaged, the error will return after power is restored. Persistent Ux codes after multiple resets indicate a hardware fault that requires board inspection or replacement.
How much does it cost to repair a Samsung air conditioner Ux error?
Repair costs vary depending on the cause. If only a technician visit and reconfiguration are needed, costs typically range from around 75 to 150 dollars for labor. If the indoor unit's main control board requires replacement, parts and labor combined can range from roughly 200 to 600 dollars or more, depending on the unit model and labor rates in your area.
Can I fix the Ux error on my Samsung air conditioner myself?
A basic power reset is a reasonable first step and may clear the error if it was caused by a temporary data glitch. Turn the unit completely off at the breaker, wait several minutes, and restore power. If the Ux code returns after the reset, the fault likely involves a failed EEPROM chip or damaged control board, which requires a qualified technician to diagnose and repair.
Is it safe to keep running my air conditioner when the Ux error is displayed?
The affected indoor unit will typically not operate normally when displaying the Ux error, as the system flags the unit as faulted. Attempting to force operation with a known EEPROM fault is not recommended, since the unit may lack its correct configuration data including capacity and operational limits. The system should be inspected before resuming regular use.

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