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Error code reference

Samsung Air Conditioner Error Code E801

EEPROM error

Samsung codesSamsung air conditioner codes

EEPROM error - communication failure between EEPROM and MICOM.

First step from the service manual

Replace PCB due to EEPROM defect.

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

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What E801 means on a Samsung air conditioner

The E801 error code on a Samsung air conditioner indicates an EEPROM communication failure between the EEPROM memory chip and the MICOM (microcomputer controller) on the main PCB. The EEPROM stores critical configuration data including system parameters, operating settings, and calibration values that the MICOM reads during startup and normal operation. When communication between these two components breaks down, the MICOM cannot retrieve the data it needs to control the unit safely and correctly, triggering the E801 fault.

This type of error is almost always a hardware-level failure originating on the main control PCB itself. The EEPROM chip may have become corrupted, physically damaged, or failed outright. In some cases, solder joint degradation or internal PCB trace damage can interrupt the communication pathway between the EEPROM and MICOM, even if both chips are otherwise intact. Voltage irregularities or power surge events can also corrupt EEPROM data or damage the chip permanently.

Because both the EEPROM and the MICOM are surface-mounted components integrated directly onto the main PCB, field-level repair of the individual chips is not practical in most service situations. The standard diagnostic approach is to replace the entire main PCB assembly. Attempting to power cycle or reset the unit will not resolve this fault, as the error reflects a fundamental hardware communication problem rather than a temporary software glitch.

Source: manufacturer service documentation.

Common causes of E801

  1. 01

    Failed EEPROM chip on the PCB

    Part replacement

    The EEPROM chip itself has failed internally, preventing any communication with the MICOM. This is the most common root cause and requires full PCB replacement since the chip is not individually serviceable in the field.

  2. 02

    Corrupted EEPROM data

    Part replacement

    A power surge or voltage spike may have corrupted the data stored in the EEPROM, causing the MICOM to fail validation checks during communication. The chip may still be physically intact but the stored data is unreadable or invalid.

  3. 03

    PCB trace or solder joint failure

    Part replacement

    Degraded solder joints or damaged PCB traces between the EEPROM and MICOM can interrupt the communication signal even if both chips are functional. Inspect the PCB closely for visible cracking, corrosion, or cold solder points near these components.

  4. 04

    MICOM processor failure

    Part replacement

    In less common cases, the MICOM itself may have failed in a way that prevents it from initiating or completing communication with the EEPROM. This also results in PCB replacement as the corrective action.

See the test procedure for each cause

Frequently asked questions about E801

What does E801 mean on a Samsung air conditioner?
E801 indicates an EEPROM communication failure on the main control PCB. Specifically, the EEPROM memory chip and the MICOM microcomputer have lost the ability to communicate with each other. This prevents the system from reading its stored configuration and operating parameters, so the unit shuts down and displays the fault code.
Can I fix the E801 error myself without replacing parts?
In most cases, no. The E801 error points to a hardware failure on the main PCB involving the EEPROM chip or its communication pathway to the MICOM. These are surface-mounted components integrated onto the board, and the recommended repair is full PCB replacement. There is no software reset or user-accessible adjustment that will resolve this fault.
Is it safe to keep running my Samsung air conditioner with an E801 error?
No. When E801 is active, the unit typically stops operating because the MICOM cannot read the configuration data it needs to control the system safely. Attempting to force the unit to run in this condition is not advisable, as the controller lacks the parameters required for safe operation. The system should remain off until the PCB is replaced.
How much does it cost to fix a Samsung air conditioner E801 error?
Repair costs depend on the specific model and labor rates in your area, but you can generally expect to pay for both the replacement main PCB and a service call. PCB assemblies for Samsung air conditioners typically range from $100 to $350 or more for the part alone, with total repair costs including labor often falling between $200 and $550. Getting a quote from a Samsung-authorized service provider is recommended.
Will resetting my Samsung air conditioner clear the E801 error?
No, a power cycle or factory reset will not clear the E801 error. This fault is caused by a hardware communication failure between the EEPROM and MICOM on the main PCB, not a temporary software issue. The error will return immediately upon restart because the underlying hardware problem is still present. PCB replacement is the required corrective action.

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