I am experiencing an issue with the N channel MOSFET below:
The MOSFET is not switching at all and I would like to understand why. I have used a similar circuit to control an LED and it always worked fine.
The HEATER_ON signal is either 30V or floating. I am measuring with the scope and I can see 5V at the gate but there is no voltage drop at the load.
What could be the reason? I know I could do this differently but I just would like to understand the reason.