Screen Display Introduction

The WT401 thermostat is equipped with an e-ink screen to monitor the environment and display the control status. This section introduces the screen display content and the related configurations.

Note: The screen performs a full refresh per hour to remove ghosting. This is normal and does not affect device operation.

Display Screen Icons

The following diagrams explain the screen icons.


Icon	Description
Battery Level	Display battery level only when the device is powered by batteries.
LoRaWAN^® Network Status	Display network status when the communication mode includes LoRa. : Joins the network. : Fails to join the network.
BLE Status	Display BLE pairing status when the communication mode includes BLE. : Paired with a controller. : Not pairing with any device. : Disconnected or transfer failure.
Child Lock	All buttons locked: normal display Partial locked: display only when the locked button is pressed
Freeze Protection	Display when freeze protection alarm is triggered from Milesight HVAC controller.
Open Window Detection (Under Development)	Display when Open Window Alarm is triggered.
Clean Alarm (Under Development)	Display when the filter cleaning is required.
Unwired Alarm	Display when the wiring settings of the connected Milesight HVAC controller are not configured.
Humidity	Display the ambient humidity.
Temperature	Display the ambient temperature. Note: If ambient temperature display is disabled, this location will display the target temperature.
Target Temperature	Display the target temperature when temperature control mode is Cool/Heat/EM Heat/Auto.
Temperature Control Plan	Display current executed plan name.
Temperature Control Mode	Display current temperature control mode.
Fan Mode	Display current fan mode.

Enable/Disable the Screen Display

By default, the screen display is enabled and all icons are displayed only when their corresponding conditions are met. Some icons can be disabled via downlink commands.

For WT401-Flat-FL model, pressing any button will activate the screen backlight for 10s after the device is turned on, making it easier to use the buttons at night. This can also be disabled via the downlink command to save power.

Over-temperature Protection

When the device detects the ambient temperature outside the 0-40 °C range for 6 consecutive times (the default collecting interval is 60s and can be changed via a downlink command), the device will turn off the screen to protect it, and all buttons will be locked. During this period, other features remain unaffected; the device can still be checked and configured via ToolBox or uplink/downlink messages. Over-temperature protection only uses embedded sensors as its data source.

To restore the screen, the device must detect the ambient temperature within the operating range (0–40 °C) for 6 consecutive times.