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How To Light A Coleman Furnace

How To Light A Coleman Furnace

Coleman furnaces have been on the market since the late 1950s. They have a decent selection of quality furnaces for both homeowners and businesses. The furnaces are easy to use, but if you’re wondering how to turn one on, you’ve come to the right place. This article will demonstrate how to turn on a Coleman furnace as well as other operational tasks.

To turn on your Coleman furnace, follow these steps:

  • Examine the air filter
  • Perform a quick inspection
  • Turn on the power.
  • As needed, adjust the pilot light.

When it comes time to replace a part or deal with an operational issue, knowing how to operate your furnace is critical. And, while Coleman furnaces, like other brands, are fairly reliable, these units will experience problems as they age. Continue reading to find out more about how to use these devices.

How To Start A Coleman Furnace

How To Light A Coleman Furnace

If you’re using your furnace for the first time since installation or at the start of the season, it’s a good idea to have the instruction manual nearby. The instruction manual will not only help you if you have problems, but it will also help you locate specific parts inside the unit.

Coleman offers a variety of furnace models, including high-efficiency and energy-star models. The operation of the furnaces, however, is typically the same. Let’s look at how to get them started.

Examine The Air Filter
It’s always a good idea to check the air filter before running the furnace for the first time or at the beginning of the season. Coleman furnace air filters are located on the side of the furnace, behind the control panel.

If you look at the instruction manual, you’ll see a diagram showing where you can replace the air filter. Remove the current filter and inspect it for cleanliness. Replace it with a new filter before turning on the furnace if it is dark grey or black.

Perform A Quick Inspection
It’s always a good idea to inspect the furnace first to make sure there are no gas leaks or debris around the base.

As you inspect the furnace’s base, smell the area near the floor for gas. In addition, look for any water around the base of the furnace, which could indicate a leak in the condensate line.

If you smell gas, do not turn on the furnace. Examine the gas line to see if the valve has come loose. If you notice any water leaks, try to locate the source. If there is a crack in the condensate line, it must be repaired before the furnace can be turned on.

Toggle The Power Switch
Next, locate the power switch, which should be on the furnace’s side, and flip it up or down as indicated by a label. If the furnace does not turn on immediately, check the thermostat. If it does, wait 3 to 5 minutes and listen for any strange sounds or noises, as this could indicate a component failure.

Make sure the thermostat is turned on and set to a temperature higher than the current temperature in the house. If the thermostat is set to “Auto,” the furnace will only turn on when the home’s temperature reaches the desired set temperature.

If the pilot light does not turn on, consult your user manual to learn how to re-light it.

As Needed, Adjust The Pilot Light
The pilot light setting may be too low for the desired temperature at times. In this case, most pilot lights are easily adjustable by turning a screw on the pilot valve. To do so, reach inside the access panel and remove the cover with a screwdriver. You should be able to increase the flame by turning the valve counterclockwise.

On A Coleman Furnace, Where Is The Reset Switch?

How To Light A Coleman Furnace

On a Coleman furnace, the reset button is located in the center of the control panel. Their precise location is between the upper and lower limit switches. The upper limit switch allows for manual reset, while the lower limit switch allows for automatic reset. Instead of the side, unscrew the screws on the sides and top of the control panel to gain access to the switches.

Both switches should be connected to four sets of wires on the inside of the panel. The wires are typically red and yellow in color. To identify them, however, it’s best to consult your user’s manual.

To reset the furnace, first ensure that the power switch on the furnace is turned off. Then, in the middle of the limit switch, press the reset button. Then, return the power switch to the “On” position.

What Is A Coleman Furnace’s Limit Switch?

The limit switch is a safety component that prevents electricity from reaching the gas valve if the furnace overheats. High temperatures can cause significant damage to the furnace’s internal components if it overheats. This could result in a fire. Before this occurs, the limit switch will cause the furnace to shut down automatically.

Why Is My Furnace Limit Switch Constantly Tripping?

How To Light A Coleman Furnace

A high limit switch will trip for one of four reasons. Let us now examine them.

The Flame Sensor Is Clogged
To begin, if the flame sensor is dirty or faulty, the high limit switch will trip. Over time, the sensor can become encrusted with debris and soot. You can either clean the sensor with sandpaper or replace it entirely.

Problems With Airflow
Following that, a reduction in airflow from the blower chamber can cause a high limit switch to trip. This occurs when air is not pushed out of the unit quickly enough. If this occurs, the furnace will quickly overheat. To avoid this, change your air filter on a regular basis.

The Blow Chamber Is Filthy
A clogged blower chamber can also cause the unit to overheat. Dirt and soot inside the chamber can slow down the blower and reduce the amount of airflow within the heat exchanger. The best way to avoid this is to put the furnace on an annual maintenance schedule so that a technician can clean and inspect it every year.

The Limit Switch Requires Replacement
Sometimes the limit switch is simply too old or faulty to function properly. When this happens, the switch will trip at too low temperatures, or it may cause the unit to short cycle and trigger a lockout.

A limit switch costs between $15 and $35 and can be purchased from any furnace reseller.

How Can I Tell If My Limit Switch Is Faulty?

The most obvious sign that there is a problem with the part is a limit switch that constantly trips. However, before replacing the part, you should perform some troubleshooting. This includes inspecting the furnace filter to ensure it is clean and debris-free. It also includes inspecting the pilot flame sensor and burner chamber for cleanliness and the absence of soot and debris.

Finally, you should have a technician check the blower motor to ensure it is operational.

The fan does not turn on; the problem is with the motor, not with the limit switch. If the blower motor is working and the air filter is clean, it’s very likely that the problem is with the limits.

How Do You Turn A Coleman Furnace Off?

To turn off a Coleman furnace, locate the power switch on the side of the control panel. Just flip the switch to the off position.


Coleman furnaces are reasonably priced and feature cutting-edge technology. We hope this post has clarified how to turn these furnaces on and off. And, if you encounter any problems, it’s best to consult your user manual before contacting a technician. You could save hundreds of dollars in repair costs by doing so.

How To Light A Coleman Furnace

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Written by HVAC Contributor

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