I have a PD-5WS with a mechanical 3 way switch. I installed the LUT-MLC at the load box between the hot and neutral. Then when the on and or off button are pressed on the PD-5WS the LED on the left side of the PD-5WS switch flashes green once and then red. Any ideas on what the problem is? This is controlling a 50 watt LED outdoor flood light.

Also just to mention. I have a second PD-5WS (with a mechanical 3 way) installed with the LUT-MLC In the backbox and that one is working fine. It's controlling rear outdoor flood lights (2) 50 watt LED