Ok so I'm new to the forum. I decided to try making a pid controller for fun. I generally never have any temp issues smoking on my webber kettle. This is literally a for the fun of it project. Well it's not fun now...... I'm pretty sure the pid is bad in some fashion. I set the target temp. to 100 degrees f for testing when I put the prob in the hot water it hits the temp and the ssr never switches my fan off. I have hooked my multi-meter to pins 3 and 4. Not matter what the temp is the voltage stays at 24v dc. Any ideas? Am I right to assume the pid is bad? I have a new one on the way and the old one goes bad tomorrow in ups.