Bator Question!

[fantastic4]

OK I have built 5 super sucessful forced air incubators and im stumped! I use HWH thermostat. I drill it out to make it more sensitive. This one I just built the light is just flashing on and off. I have never had one do this. I have tried repositioning fan and thermostat. plugged and unplugged vent holes. What to doooo???

 

[Goblnfvr]

I would try another thermostat.
The one you are using maybe faulty