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Error code reference

LG Hvac Error Code RE

PTAC set for wall-mount thermostat by DIP switch 1 in on position.

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PTAC set for wall-mount thermostat by DIP switch 1 in on position.

First step from the service manual

DIP switch #1 off = touch pad controls on unit, DIP switch #1 on = remote thermostat.

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

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What RE means on a LG hvac

The RE code on an LG PTAC (Packaged Terminal Air Conditioner) unit is not a fault or malfunction indicator. Instead, it is a configuration status code that signals the unit has been set to operate under the control of a remote wall-mount thermostat rather than its own built-in touchpad controls. This configuration is controlled by DIP switch number 1 located on the unit's control board. When DIP switch 1 is placed in the ON position, the PTAC transfers temperature control authority to an externally wired wall thermostat, disabling the onboard touchpad for temperature regulation.

The DIP switch configuration is a deliberate setup choice, commonly made during installation in hotels, assisted living facilities, or commercial spaces where centralized or remote thermostat control is preferred or required. When DIP switch 1 is in the OFF position, the unit responds to its own touchpad, allowing the user at the unit to adjust settings directly. Switching it to the ON position hands over that control to the remote thermostat wired to the unit. The RE code simply confirms this mode is active.

If RE appears unexpectedly and a remote thermostat was not intentionally installed or configured, the technician should inspect DIP switch 1 to confirm whether it was inadvertently toggled to the ON position. Returning DIP switch 1 to the OFF position will restore local touchpad control and clear the RE status code from the display. No component replacement is required unless the DIP switch itself is physically damaged.

Source: manufacturer service documentation.

Common causes of RE

  1. 01

    DIP Switch 1 intentionally set to ON for remote thermostat use

    Wiring / connection

    The most common reason for the RE code is a deliberate installation choice to use a wall-mount thermostat for control. This is standard in hotels and commercial buildings and requires no corrective action if the remote thermostat is properly wired and functioning.

  2. 02

    DIP Switch 1 accidentally toggled to ON position

    Wiring / connection

    During servicing or handling of the control board, DIP switch 1 may have been inadvertently moved to the ON position. Inspect the switch and return it to OFF to restore touchpad control and clear the RE code.

  3. 03

    Remote thermostat installed but not properly wired

    Wiring / connection

    If DIP switch 1 is ON but no functional wall thermostat is connected, the unit will be in remote control mode with no valid input signal. Verify the wall thermostat wiring is complete and correct before proceeding.

  4. 04

    Unit replaced or swapped without reconfiguring DIP switches

    Wiring / connection

    When a PTAC unit is replaced with a refurbished or different unit, the DIP switch settings from the previous configuration may not match the new installation. Always verify all DIP switch positions match the intended control setup during unit replacement.

  5. 05

    Faulty or damaged DIP switch holding incorrect position

    Part replacement

    In rare cases, a physically damaged DIP switch may not hold its set position reliably or may have been forced. If the switch cannot be toggled correctly, the control board may need replacement.

See the test procedure for each cause

Frequently asked questions about RE

What does RE mean on a LG hvac?
The RE code on an LG PTAC unit indicates that DIP switch 1 on the control board is in the ON position, which configures the unit to be controlled by a remote wall-mount thermostat rather than the touchpad on the unit itself. This is a configuration status indicator, not a fault code. It will display whenever this mode is active.
How do I fix the RE code on my LG PTAC unit?
If you want to restore local touchpad control, set DIP switch 1 to the OFF position on the unit's control board. If a remote wall thermostat is intended to be used, the RE code is expected and no fix is needed. Always power down the unit before accessing the control board and adjusting DIP switches.
Is the RE code on my LG PTAC a safety concern?
No, the RE code does not indicate a safety issue or a system failure. It is purely a mode indicator showing how the unit is configured for thermostat control. The unit will continue to operate normally under the control of the remote thermostat while this code is displayed.
Will resetting the LG PTAC clear the RE code?
A standard power reset will not clear the RE code because it is determined by the physical position of DIP switch 1, not by a software fault state. The code will reappear after any reset as long as DIP switch 1 remains in the ON position. To clear it, the DIP switch itself must be moved to the OFF position.
How much does it cost to fix the RE code on an LG PTAC?
In most cases there is no parts cost at all, since the RE code is resolved simply by adjusting DIP switch 1. If a technician is needed to access and reconfigure the switch, expect a service call fee in the range of $75 to $150 depending on your area. If the DIP switch or control board is physically damaged and requires replacement, costs will be higher depending on the specific board required.

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