Needed some guidance for my circuit: Have a circuit consisting of a microcontroller + SSR relay + load (heaters).....issue is when the temperature reaches cutoff the heaters are not getting stopped and temp. keeps on increasing..... I have a connection of outputs from microcontroller into points 3 and 4 of the relay.....all lives into point 1 and all neutrals into point 2. Have tried to measure potential difference between points 3 and 4 and it shows in Millivolts???? Another thing is the relay LED light does not come on.......is it because the output is too low (relay is 0-5 V logic) or could it be that the relay is bad? Am scratching my head as I do not want to order another relay if it is not the problem...is it my circuit or my relay or is my controller not giving enough o/p in DC to activate the relay?