Samsung MWR-WE10N Installation Manual page 15

Wired Remote Controller Installation
Initializing Your Wired Remote Controller Communication
If the number of indoor unit or ventilator(ERV) is decreased while you are using your remote control to control one
indoor unit, ventilator(ERV) or a group of indoor units and ventilator(ERV), then you need to initialize your remote
controller communication.
1. Press the Esc and Delete buttons at the same time for more than five seconds.
Your Wired Remote Controller will be initialized, and the device will search for the indoor units/ventilator(ERV)
connected to your Wired Remote Controller again.
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