Yeah about 10 years and only had to change the temp cable. I plan on opening it up and take a look at the connections inside. Maybe like Matt said something is loose. Hopefully that will be all that’s needed, if more than that I may just go with the Ezboil controller. Thanks for your feedback.
I have the exact same problem! Did you find a solution or answer to why it’s fluctuating? I also have the SYL 2342 PID also from High gravity. I noticed the next day after a brew when I was heating water and PBW for a cleaning cycle, the reading was bouncing around, 128, 131, 129 etc. I had this...