Hello Knguyen,
It should work fine:
So,
First replace the battery, even if it was delivered with a ‘new’ one; try to pair the unit again.
If that makes no difference, continue reading:
When it’s the only zigbee unit, I advice you to reset Homey’s zigbee.
Now, when you want to pair the unit again, make sure to keep it very close to Homey, just few inches/centimeters.
