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Furnace on and off few seconds after?

Updated: 9/16/2023
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13y ago

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check your flame sensor

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13y ago
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Q: Furnace on and off few seconds after?
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How can you test thermostat in your furnace?

Set thermostat to desired temperature; lets say, 70 degrees Fahrenheit, a few seconds will go by then the furnace should activate. Once the furnace heats the room to the set temperature the furnace should shut off.


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A heat pump will do this, a furnace should not. Are you sure you have a furnace?


Is it better to turn the furnace off or leave it on?

Obviously a furnace - or indeed any other appliance - will use no energy at all if it is completely switched off. If you don't want to spend any money on heat energy then of course it is "better " to turn the furnace off. It depends what you mean by "leave it on": even if you leave the electricity and gas on, (or oil if it's an oil burner), if the temperature of the room or building is high enough to make the air-termperature thermostat switch the furnace's burners off, the furnace won't actually be running and consuming very much energy. All the furnace would consume in that condition is a few Watts of electrical power to supply its control circuit and maybe a few Watts more to drive a water circulating pump for the radiators, if that is how your system works. Of course you could turn the furnace's main control switch "off" so that the furnace will stay off even when the air temperature falls enough to cause the control thermostat to switch over to put the furnace's burners on... Then you would save a few Watts of energy but would lose the convenience of having the furnace heat your home and water automatically. Instead you would have to switch the furnace on yourself every time you wanted some heat. So, do you want "convenience" or "inconvenience"? It's up to you to decide...


What would cause a car to cut off within a few seconds of starting?

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