Fairly simple setup. 60amp breaker, THHN #6 Red -> L1 on the HPWC 60 amp breaker, THHN #6 Black -> L2 on the HPWC <house groujnd> , copper bare -> copper ground on HPWC Flip on the breaker, no LED (yes the ribbon is connected) no red, no yellow, no green, nothing. Volt meter shows 120 between L1 and ground, and 120 between L2 and ground. Interestingly it does not show 240 between L1/L2 but that may be the internal design of the HPWC. What else would cause no LED?