LG HVAC Error Code RE

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.

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.

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.

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.

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.