I went to start a batch this morning, but couldn't get the boiling bucket to kick into life. I'm using a 33ltr polypropelene bucket with two 2.2kw kettle elements mounted in the bottom. The supply is regulated by a PID/SSR combo box, which I've tested and it appears to be working normally. As far as I can tell, power is getting to both elements but neither one is drawing it through and generating heat. The circuit doesn't trip. What do you think?