if you're not using a thermostat I'm guessing your snake could possibly have a burn... Like Merchant said if UTH's are left un-regulated they can get up to 130 degrees... Dials are crap and it was probably measuring your ambient temperature if it was doing anything. You really need to get a thermostat and digital gauge as soon as possible. I would recommend the hydrofarm for 30 dollars. Its cheap and does its job. Good luck.

-Alex