Where is the reset on a Coleman furnace?

Locate the manual reset switch near the left side of your furnace blower. Your Coleman furnace has an upper limit switch for manual reset and a lower limit switch for automatic reset.

What causes a furnace to light then go out?

Your furnace has a limit switch that keeps it from running if the heat exchanger is too hot. Dirty filters, closed or blocked vents and other blockages in airflow are common causes of an overheated furnace. A bad limit switch. The limit switch may be bad and need to be replaced.

Why does my Coleman furnace keep shutting off?

If your furnace keeps shutting off, it could be due to low airflow. There are several indirect issues that cause low airflow. Dirty Air Filters. If you don’t change your air filters often enough, the filters will become dirty and clogged, which means the heat exchanger retains heat and eventually causes it to overheat.

How do I reset a Coleman furnace switch?

Turn the Coleman furnace system switch to the “Off” position on the electric service panel. Locate the manual reset switch near the left side of your furnace blower. Press the reset button, which you will find in the middle of the limit switch. Turn the system switch to the “On” position.

What should I do if my furnace flame sensor goes out?

Clean your flame sensor with steel wool or emery cloth (fine sand paper). You might need a new flame sensor, but most of the time they can be cleaned and your furnace will work well after cleaning. I have seen the flame sensor go out. Most of the time when they go out the white porcelain is cracked.

What to do when your furnace goes into lockout?

After 3 times the furnace goes into lockout, and the only way to get it out of lockout is to turn the power switch off and on. Everything starts over again without ignition of your gas burners. Solution: First, turn off the power to your furnace.

What kind of relay do I need for my furnace?

I tracked down a replacement relay at a local electronics store, and ended with a 16-amp rated 12 volt SPST of similar but slightly larger size, which had two pins fitting directly into the board with the other two pins able to be extended (by soldering short solid wires) to reach the corresponding holes in the circuit board.

What happens when the main burner on a furnace ignites?

Problem: Your furnace main burner ignites, the main burner stays on for 8 to 10 seconds, then shuts right back off. Your furnace tries this ignition sequence again, and the same thing happens.