All right. Gas water heater trouble shooting. If you have no hot water and you come home, first thing you want to look at is, "Is there a puddle of water beneath my water heater?" If yes, you're going to want to shut it off. If no, you're going to want to look down here, and there's a little sight glass. You have to get down pretty low. In that glass, you should see a blue flame. You'll notice these are all sealed. It means you can't put your hand in here, all that stuff. You have a couple of things down here. This is a reset for if there's too much temperature inside, it'll shut off the water, it'll shut off the gas.
I mentioned before if you're at a, at like a gas grill, if you ever have to re-light your water heater for some reason, it's a windy day, it blew out the pilot, what you're going to want to do if you have no hot water, you're going to want to depress the pilot valve. That's going to allow gas to flow into the unit. And then, you're going to want to hit this piezo, and that's going to send a spark to the gas. You have to verify that the pilot is lit by looking at it and you're still holding down the pilot switch. You have to hold it down for at least 30 to 60 seconds, so that the thermo couple gets warm enough to maintain the pilot. Then you're going to slowly release the pilot switch, take a look down, make sure it's still lit. If it's lit, turn the switch to the on position, and you're going to hear a flame, and the flame is going to be back on inside the water heater.