Your Wallcast unit should have been supplied with a holder to attach to non-magnetic surfaces
Make sure the LED Sensor face is pointing at the Wallcast unit and there is nothing between them. Use a ladder or some other equipment if you cannot see the top surface of the LED Sensor when it is high up. Care must be taken when using ladders. Equipment must be in good condition. Check for loose steps, broken rivets etc. before use.
Make sure the LED Sensor face is pointing at the Wallcast unit and there is nothing between them.
Try changing battery. If the problem persists go to support.prometheanworld.com, a new LED Sensor may be required.
If a "-" is displayed then go to support.prometheanworld.com. A new WallCast unit may be required. If it flashes on and off intermittently then the LED sensor is working correctly.
If the LED Sensor does not display the number 9 before you place it on the surface, go to support.prometheanworld.com. A new LED Sensor may be required.