Anet A6 Extruder Problem

Hello!

My Anet A6's extruder isn't heating up when I initiate a print. I have checked all the wiring, and it looks good. The hotbed heats up to the temperature set by the gcode, but the extruder remains at 0 degrees. It looks like: extruder 23'/0' and hotbed 25'/50'. The extruder is able to manually heat up when you set the temperature; however, it still doesn't heat up when a print is initiated. Is this a thermistor issue? My wiring is correct and the thermistor is secured inside the hot end. Could it be a mainboard issue?

Thank you for the help.

This is appreciable post