Is what tells a furnace to turn on or off to maintain a specific temperature?

Your thermostat will tell your furnace to turn on and produce heat until it gets to the threshold of 70 or above.

Why does my oil furnace keep turning on?

When a furnace keeps turning on and off, it is usually due to short cycling. This is the term used to describe problems originating from within the heating system. If short cycling is not promptly diagnosed and corrected, it could cause permanent damage to your heating unit and higher utility bills.

Why does my furnace run when the thermostat is off?

The fan limit switch is responsible for turning the blower on and off at the appropriate times. So, when the switch is working correctly, your furnace fan should turn on several minutes after thermostat calls for heat and turn off several minutes after the heat cycle ends.

Why do I have to keep hitting the reset button on my oil furnace?

If you have a gas or oil furnace, the reset button may trip if you are out of fuel. This fix is as simple as making sure there is fuel in either the gas or oil tank. Blocked or closed valves could be another reason the tank reset button keeps tripping.

When should a thermostat kick on?

Getting the setback temperature right for your home can take a while and might require a bit of experimenting, but a good starting point is 60 degrees. The average home needs approximately 1 hour to warm up from 60 degrees to 70 degrees, so you should adjust your program accordingly.

What are the symptoms of an oil forced air furnace with a hole in the heat exchanger?

Six Signs Your Furnace Heat Exchanger May be Cracked

• Strange smells. A malfunctioning heat exchanger will often create an unpleasant and strong odor that smells similar to formaldehyde.
• Soot Build-up.
• Corrosion & Cracks.
• Change in the flame appearance.
• Audible Sounds.
• Presence of Carbon Monoxide.