mypros+
Error code reference

Samsung Air Conditioner Error Code E604

Error of setting option for wired remote control COM2.

Samsung codesSamsung air conditioner codes

Error of setting option for wired remote control COM2.

First step from the service manual

Check DIP switch settings on wired remote controller.

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 E604.

  • 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 E604 means on a Samsung air conditioner

E604 is a configuration error specific to the COM2 communication port on a Samsung wired remote controller. This fault indicates that the DIP switch settings on the wired remote control unit do not match the expected configuration for the system it is connected to. The COM2 port handles communication between the wired remote controller and the indoor unit or central control system, and when the option settings are mismatched or improperly configured, the system flags this error to prevent incorrect operation.

The DIP switches on a wired remote controller define operational parameters such as unit address, system type, and communication protocol options. If these switches are set incorrectly during installation, after a controller replacement, or following a system reconfiguration, the indoor unit will detect the mismatch on the COM2 line and trigger E604. This can also occur if a new remote controller is installed without being configured to match the original unit settings, or if the switch positions have shifted due to vibration or accidental contact.

Diagnosis begins with physically inspecting the DIP switch bank on the wired remote controller and comparing each switch position against the required configuration for the specific system model. The correct switch settings are typically documented on a label inside the remote controller housing or in the installation diagram for the indoor unit. After correcting any switch positions, power cycling the system is usually required to clear the fault and allow the COM2 communication to re-establish properly.

Source: manufacturer service documentation.

Common causes of E604

  1. 01

    Incorrect DIP switch configuration on wired remote

    Wiring / connection

    The DIP switches on the wired remote controller are set to positions that do not match the system requirements for the COM2 port. Inspect each switch position against the configuration label inside the controller housing or the system installation diagram.

  2. 02

    Wired remote controller replaced without reconfiguration

    Wiring / connection

    A replacement wired remote controller may ship with default DIP switch settings that differ from what the specific system requires. The switches must be manually set to match the original unit configuration before use.

  3. 03

    DIP switch position shifted unintentionally

    Wiring / connection

    Physical vibration, accidental contact during servicing, or rough handling can cause one or more DIP switch positions to change from their correct settings. A visual inspection of each switch is needed to confirm all positions are correct.

  4. 04

    Faulty wired remote controller

    Part replacement

    If the DIP switches are confirmed to be in the correct positions but E604 persists, the internal circuitry of the wired remote controller may be defective, causing it to transmit incorrect option data over the COM2 line.

  5. 05

    COM2 wiring fault affecting signal integrity

    Wiring / connection

    Damaged, loose, or improperly terminated wiring on the COM2 communication line can corrupt the option signal between the remote controller and the indoor unit, triggering this error even when DIP settings are correct.

See the test procedure for each cause

Frequently asked questions about E604

What does E604 mean on a Samsung air conditioner?
E604 indicates a setting option error for the wired remote controller on the COM2 communication port. The indoor unit has detected that the configuration transmitted by the wired remote does not match the expected system settings. This is typically caused by incorrect DIP switch positions on the remote controller. It is a configuration fault rather than a hardware failure in most cases.
How do I fix E604 on a Samsung air conditioner?
Start by locating the DIP switch bank on the wired remote controller, usually accessible by removing the controller cover. Compare each switch position to the correct configuration specified for your system model, which is often printed on a label inside the controller or in the installation documentation. Correct any switch positions that are wrong, then power cycle the system to allow the COM2 communication to re-initialize and clear the error.
Will resetting the air conditioner clear E604?
A simple power reset will not permanently clear E604 if the underlying DIP switch configuration is still incorrect, because the error will return as soon as the wired remote controller attempts to communicate over COM2 again. The fault will only clear reliably after the DIP switch settings are corrected to match the system requirements. Once the configuration is fixed, a power cycle is typically needed to complete the reset.
Is E604 on a Samsung air conditioner a safety concern?
E604 is a configuration communication error and does not indicate an electrical hazard or risk of component damage under normal circumstances. However, the system may restrict operation or disable certain functions while this fault is active to prevent incorrect behavior. It is best to address the configuration issue promptly to restore normal system operation.
How much does it cost to repair a Samsung air conditioner showing E604?
If the issue is simply an incorrect DIP switch setting, the repair may only involve a service call fee, which typically ranges from $75 to $150 depending on the technician and region. If the wired remote controller itself is found to be defective and needs replacement, parts and labor combined can range from $150 to $400 or more depending on the specific controller model and local labor rates. In many cases no parts are required at all.

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