I have a 2 year old Pro Melt. I'm pretty sure that the thermostat is faulty. At a setting of 725, it has been swinging +/- 50 degrees or more. Dipping down to 650 then climbing to 800. Once, it did not cycle at all and suddenly the spout was frozen. The weird thing is that if it is running hot or cold (where I know it should cycle on/off) and I adjust the knob barely, it responds. I keep the pot between 1/4 and 3/4 full typically.
There is definitely something not right. I am literally 2 days away from my warranty end. Lucky! I spent the day casting a bunch of bullets, then drained the pot.
I'll ship it tomorrow or Tuesday. The rep at RCBS said to send it in, or they would just mail a thermostat to me with instructions for how to drill out the rivets and to re-wire it. I'd like them to do the work. Apparently if it is out of warranty, they'll send a thermostat anyway. Great service!
I've considered skipping the warranty work and going straight to PID, but thought I'd at least get it in good working order before the warranty is gone.