No, it heats up if on boil, but the temp controller won't let me change the set temp. I have a spare STC-1000 I think, so I am going to try wiring that in unless I hear from Grainfather of another route. I plan to upgrade to the new controller, so replacing it seems a waste and I have grains standing by!
I had similar issue after I messed up the settings when trying to changing temperature unit and other parameters. GF sent me a replacement and told me not to do that again. The controller is a backup for me because I have built a WiFi-enabled, automatic, ArdBir-like controller.