mypros+
Error code reference

Samsung Air Conditioner Error Code E5

Setting error of option switch in indoor unit

Samsung codesSamsung air conditioner codes

Setting error of option switch in indoor unit - wired remote controller address mismatch with RMC address of indoor unit.

First step from the service manual

Check SW03 switch settings; verify wired remote controller address matches indoor unit RMC address.

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

MyPros+ Max

Get the full diagnostic procedure for E5.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What E5 means on a Samsung air conditioner

The E5 error code on a Samsung air conditioner indicates a setting error related to the option switch in the indoor unit, specifically an address mismatch between the wired remote controller and the RMC (Remote Controller Module) address configured on the indoor unit. This is a communication configuration fault rather than a hardware failure. The indoor unit uses a DIP switch bank designated SW03 to define its RMC address, and the wired remote controller must be programmed or set to match that same address for proper communication to be established between the two devices.

When these addresses do not match, the indoor unit cannot properly recognize or respond to commands from the wired remote controller, triggering the E5 fault. This type of error is most commonly introduced during initial installation, after a control board replacement, or when multiple indoor units are installed in a multi-zone system and address assignments are not carefully coordinated. In multi-unit installations, each indoor unit and its corresponding wired remote controller must share a unique, matching address to prevent conflicts.

Diagnosing this error requires physically inspecting the SW03 DIP switch positions on the indoor unit's control board and comparing that address setting to the address configured on the wired remote controller. Both must be set identically. If a mismatch is found, correcting the switch positions or reconfiguring the remote controller address will resolve the fault. No refrigerant handling or electrical component replacement is typically required to clear this error.

Source: manufacturer service documentation.

Common causes of E5

  1. 01

    Incorrect SW03 DIP switch setting on indoor unit

    Wiring / connection

    The SW03 switch bank on the indoor unit control board may have been set to the wrong address position during installation or after servicing. Inspecting the physical switch positions and comparing them to the wired remote controller address will confirm this.

  2. 02

    Wired remote controller address not configured to match indoor unit

    Wiring / connection

    The wired remote controller has its own address setting that must match the RMC address on the indoor unit. If the controller was replaced or factory-reset, its address may have defaulted to a value that no longer matches the indoor unit.

  3. 03

    Address conflict in a multi-zone installation

    Wiring / connection

    In systems with multiple indoor units, duplicate or incorrectly assigned addresses can cause one unit to receive the wrong address setting. Each indoor unit and its wired remote must have a unique matching address pair.

  4. 04

    Control board replacement without reconfiguring SW03

    Wiring / connection

    If the indoor unit control board was recently replaced, the SW03 switch positions on the new board may differ from those on the original board. The address must be manually set to match the wired remote controller after any board swap.

  5. 05

    Faulty or damaged wired remote controller

    Part replacement

    In rare cases where the address settings are confirmed correct but the E5 error persists, the wired remote controller itself may have a defect preventing it from communicating the correct address to the indoor unit.

See the test procedure for each cause

Frequently asked questions about E5

What does E5 mean on a Samsung air conditioner?
The E5 code on a Samsung air conditioner indicates an address mismatch between the wired remote controller and the indoor unit's RMC address setting. The indoor unit uses a DIP switch bank called SW03 to define its address, and the wired remote controller must be set to the same address. When these two settings do not match, the system cannot communicate properly and displays E5. This is a configuration error and does not indicate a refrigerant or mechanical failure.
How do I fix the E5 error on my Samsung air conditioner?
Start by locating the SW03 switch on the indoor unit control board and noting the current address setting. Then check the address setting on the wired remote controller and confirm both values match exactly. If they differ, adjust either the SW03 switch or the remote controller address setting so they are identical. After correcting the mismatch, the error should clear and normal operation should resume.
Is the E5 error on a Samsung air conditioner dangerous?
The E5 error is not a safety hazard. It is a communication configuration fault that prevents the wired remote controller from properly controlling the indoor unit, but it does not indicate any electrical, refrigerant, or fire-related risk. The system may stop operating until the error is resolved, but no immediate danger is present.
Will resetting my Samsung air conditioner clear the E5 error?
A simple power reset is unlikely to permanently clear the E5 error because the underlying address mismatch between the wired remote controller and the SW03 setting on the indoor unit will still exist after the unit restarts. The error will return until the address configuration is corrected on one or both devices. Resetting can be useful to confirm whether the fault reappears, but it does not substitute for correcting the address settings.
How much does it cost to repair the E5 error on a Samsung air conditioner?
If the fix only requires adjusting the SW03 DIP switch or reconfiguring the remote controller address, the cost is primarily the labor charge for a service call, which typically ranges from $75 to $150 depending on location and technician. If the wired remote controller itself is faulty and requires replacement, parts and labor combined could range from $150 to $400 or more depending on the specific model and controller type.

Related Samsung air conditioner codes

All Samsung air conditioner codes
View all 572 Samsung air conditioner codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass