Originally Posted by kal
Yup. Sounds like something is set wrong or wired wrong. Could also be something defective.
Try a simple test: Set the PID to AUTO mode and set it to around 100F and try to heat some cold water to that temp. Without having done auto-tuning it should get to that temp and stay pretty close. Auto-tuning just makes it more accurate.
If you go more than a degree or two above (and keep rising) something is not right and odds are that the element is firing continuously.
If the little "OUT" light on the PID is always on once you go past that 100F set point then the problem is in the PID settings, the PID is defective, or you're not actually in AUTO mode (hit the A/M button - the A-M light should be OFF when in AUTO mode).
Check the SSR light. If it doesn't go on/off in unision with the PID "OUT" light but stays on all the time (or is always off) then you've wired incorrectly or the SSR is defective (always on).
When I set my PID to 100, it went to 100 just fine and then shut off. The out light and the SSR light both shut off in unison.
When I went to set the temp to 154 and tried doing the AT set to 2, it ran all the way up to 166 before I shut it off. I am not sure why this keeps happening. Also, when I set it to AT the A/M light didn't flash on and off like you say it does on the Setup page.
Here is a picture of my PID. I had an knowledge electrician/technician help me wire it. The only thing I see funny, which doesn't follow your schematic is the nuetral wire (yellow #9) running to #13.