I recently purchased a Sigelei 150w TC. It's been great and I have had no complaints up until I tried to put a new nickel coil into my Kanger sub tank. The stock nickel coilhead that I had already been using in my tank worked perfectly with the temperature control mod but as soon as I dropped a new coilhead in the screen kept flashing "dry coil no liquid." Then I read in a couple of other forums that by holding the plus and minus buttons at the same time you can lock the ohms and this solved my problem. NOW my problem is that I can not figure out how to UNLOCK the ohms so that the mod reads the resistance automatically like it did out of the box. Anyone??