Thanks for the info sguido!

@Aaron, I'll use the first picture. I already check my incubator yesterday, the wiring and connection etc. I already remove the 2 foot heat tape and remain the 3 foot heat tape in the middle, then I run and set to 89 deg F. then after 30 minutes the temperature in the thermostat begin to increase then I leave overnight. I woke up this morning and immediately check my incubator now in sets to 89-89.1 deg F.

My problem is the temperature inside the egg plastic container is 86.1 - 86.5 deg F. and 60-61 % relative humidity. What is the possible problem now? Can I raise to 90 deg F or put some small holes in the egg plastic container to raise the temp?

Thanks!