How to Operate a Gas Furnace

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When attempting to operate a gas furnace, the first step is to make sure the furnace is getting power, after which the gas supply should be checked through the gas valve. Discover methods of telling whether or not a gas valve is on with help from a plumber and HVAC tech in this free video on gas furnaces.

Part of the Video Series: Plumbing & HVAC Maintenance
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Video Transcript

When you are going to operate your gas furnace there are a few things you should definitely check first. You always got to make sure you have power to your furnace first, whether it is your fuse box or your breaker box make sure you have got sufficient power to your power supply on your furnace. Fuses are on, fuses are correct, not blown and in most instances you have a switch on your furnace, on/off switch, make sure this is on the on position and then you have got to check your gas supply to your furnace. You should always have a gas valve on your furnace. This gas valve is on currently but you should be able to tell the difference in the way your gas ball valve is shown. If it is going with the flow that means it is on. I'll show you how it is off and against the flow. If it is crossed you know it is against the flow. If it is going with the current you know it is on. Other than that this furnace should be in perfectly running shape right now. We'll go take a look upstairs, turn on the thermostat, and make sure everything fires up fine. Now that we know that everything down in the basement is functioning properly you are going to come upstairs to your thermostat and of course make sure your thermostat is in the auto position, make sure it is on heat or cool depending on which time of the season you are in, turn your temperature up or down and once you do that and your furnace fires up, you're good to go.

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