18 
CONTENTS
Detector does not turn on, or turns off by itself (with or without ‘bF’ indication)
1�  Charge or replace the batteries�
Erratic/excessive noise
1�  Move away from local sources of Electromagnetic Interference (EMI)�
2�  Restart the detector and wait for Automatic Noise Cancel to complete�
3�  Reduce the Sensitivity level (page 7)�
No sound – Wired headphones
1�  Check that the detector is on, and start‑up has completed�
2�  Check that the headphones are plugged in�
3�  Check that Volume is set to an audible level�
4�  Unplug the headphones and confirm that the detector speaker is audible�
5�  If available, try using a different set of headphones�
No sound – ML 80 Headphones
1�  Check that the headphones are turned on�
2�  Check that detector Bluetooth is turned on and paired with Bluetooth headphones (i�e� the Bluetooth icon is steady on)�
3�  Check that the headphones are charged�
4�  Check that the detector Volume is set to an audible level�
5�  Ensure the volume control on the headphones is set to an audible level�
6�  Try a different set of Bluetooth headphones�
7�   Try wired headphones�
ML 80 Headphones will not pair
1�  Try powering off the ML 80 headphones and then re‑pair�
2�  Ensure the headphones are within 1 metre (3‑feet) of the detector control unit, with no obstructions between the 
headphones and detector (including your own body)�
3�  Move away from sources of interference such as mobile phones�
4�  If there are many other Bluetooth devices nearby, pairing may take longer� Move away from the area and try to pair again�
5�  Perform a factory reset on the headphones and attempt to re‑pair to the detector�
6�  Pair the detector with different Bluetooth headphones, then attempt to re‑pair ML 80 headphones to the detector�
Distortion/crackling heard in ML 80 Headphones when connected via Bluetooth.
1�  Reduce the volume on the headphones until distortion is removed� Increase detector volume if required to compensate for 
the reduced volume�
Troubleshooting