Very Important. Do you have the element connected? If not - all bets are off...
Yes, element plugged in, breakers on, 120V on the outlet. It's the leg going from the breaker to the contactor. The leg passing through the SSR is not getting through to the contactor.
I'm disappointed that my 240V indicator lights are on with 120V, so as they're currently wired, I'm only getting a solid light that the contactor has closed the contacts and one hot leg is lighting the LED.