How to erase then re-learn sensors in QH series system?
QH series erase and re-learn process:
Do step 4 first, then step 1 to 3 as shown below:
If it's still not working, then the sensor doesn't function anymore, and it needs to be changed.
If you hear a chirp sound from the receiver, that usually means the battery power is low in the receiver, change them with fresh ones.
Check out more details in the instruction: