OK, so I have recently put together my DIY incubator using an old wine fridge. I'm using a 12" piece of 11" flexwatt for heating, and have it hooked up to my Herpstat. This is my first experience using a Herpstat, as I ordered one specifically for this incubator (the fact that I could adjust to tenths of degrees, along with Herpstat's reputation, is what sold me on using one of these for an incubator); I originally had this hooked up to a Zilla Temperature controller, but my temps were flucuating way too much, and decided to go with another thermostat. I have the Herpstat set to 90 degrees F (for my testing--no eggs in there), but the temps aren't getting above 78 dergrees . . . any idea what might be causing this?

Pics below so you can see what I've done. Maybe someone better at DIY stuff can tell me where I've gone wrong. I've tried the probe in different places: taped to the flexwatt, laying loose in the fridge, tucked into an egg box . . . no higher temp results. The Herpstat is acting like it's not trying to heat above 77-78. The red light is on, like it's on full power trying to heat it up, but it just doesn't get there.






Thanks in advance!