Please try the following:
1. The power switch on the baby unit is set to OFF. Switch it ON.
2. Check that the beep is not a result of setting the alarm . Select OFF in the alarm menu .
3. Verify that the connections on the baby unit and at the electrical outlet are secure.
4. Check that the wall outlet for the baby unit is working by plugging in another device, such as a lamp.
5. If the units are out of range, a beep will sound. Lift the antenna on the parent unit for optimal reception.