What The 2 Beep
This Tech Tips video explains what 2 beep means and how to fix
Two beeps indicate high voltage. This means the voltage supplied to the device is higher than the device is designed to handle.
To fix the two beeps (high voltage), reduce the voltage to the appropriate level for the device. Make sure the power supply is set to the correct voltage 24VDC +/- 10% to avoid overloading the device.