How to Test a GM8S115C16UH11 Coleman Furnace

Coleman manufactures a line of gas furnaces, such as the GM8 model. These furnaces are comprised of many components, from the burner assembly to the ignitor. If one of these components is damaged, the whole furnace could be at risk. There are quick ways to test your Coleman furnace to ensure the unit is functioning properly.

Steel wool

Instructions

- 1
  Slide the front access panel up and off the unit. The internal components of the furnace will now be visible.
- 2
  Examine the burner assembly. Make sure the openings of the burner are clear of dust and debris. Clean the burners with steel wool, if necessary.
- 3
  Examine the ignitor. This is a metal assembly with a ceramic base located near the burner. Ensure that the wiring is plugged securely into the base of the ignitor. If it isn't, unplug it and plug it back in, making sure it is secure.
- 4
  Check the flame sensor. This is a metal rod located near the ignitor, the component that ensures the ignitor is working before the burners can light.. Clean it of dirt and grime with steel wool.
- 5
  Turn on the furnace via the thermostat and watch the components as the unit lights. Replace the front access panel when finished.

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