Alright, this is a gas furnace, 90 percent. There's a problem with the light blinking three times. There's a light down here. And when you turn it on, you can press this button. The light comes on. Now, I already did it, but the light blink three times and it tells you that it's the pressure valve. So, if you can suck on that hose, you know, usually I just take the hose and I'll just suck on it and you'll hear it click. And then it'll fire up. So, while you're suckin' on it, you can just suck on it, bend it to keep the air in, push this down. And then you see the fires. If it does fire, then there's nothing wrong with that. Put this back on. Put that back on there. You want to check your exhaust line. Okay. That exhaust line goes outside. So, what I did right there, right now there's nothing in there, but there was a bees nest in there. So, what I did is take my vacuum. Okay. Take off this clamp and you can pull this whole pipe off. The pipe lamp. Take this, the drain line out. That's for water. Try to stick it over here like this. And then, put my hose on there. I suck the bees nest out. And then you just stick this back on. It's time to paint and get back on. I got my hose back on. Now, what you can do is just press this in. I make sure your thermostat inside the house is set to a higher, you know, higher than the temperature in the house. It's going to start up. I mean, you push that down and we'll just see if it fires up. You got an electric, this has a electronic ignition. It's kind of like a filament for a late bulb. A little bit different. It's kind of bigger than that though. We'll just see if it lights up. There it goes. Now, if you're doing this, you could do the same thing. If that doesn't light up, then you know there's something wrong with that. You could change that. That's really easy. There's a plug right there. Two screws. And it comes out. You stick a no one in there. It takes about five minutes. So we're back on. It's all working. Stick our door back on. That needs these doors. There we go. Sometimes we want to check to make sure this hose isn't clogged up also. That's got to suck to open that valve up.