Why does my flame rollout switch keep tripping?

Rollout switches trip because flames are burning back where they are not supposed to be. Possible causes include a stopped up vent, a stopped up heat exchanger, low gas pressure, or a cracked heat exchanger. A cracked heat exchanger can also lead to tripped rollout switches.Click to see full answer. Similarly one may ask, how do I know if my limit switch is bad?The switch should be immediately suspect if the voltage drop is 0.2 VDC or higher (Fig. 1 indicates a bad limit switch). Verify that your ohmmeter will read “0” when the two leads are shorted together. The meter should read between “0” and “0.1” Ohms.One may also ask, what is a rollout switch? The rollout switches are placed as a safety device around the burner area to sense the hot flame or hot exhaust thus shutting down the furnace so you do not get a fire or get carbon monoxide poisioning. The push button manual set rollout switch is located in the middle. Similarly, what does a rollout switch look like? Roll out switches are generally located near your furnace’s burner box. They are round, with a switch sticking out of the top. Two strips of metal of equal length (about an inch long each) are attached to either side of the switch. The metal strips have a hole at the end furthest from the switch.What causes flame rollout?Flame rollouts in gas furnaces and boilers are caused by a high concentration of combustion gases inside the combustion chamber. Normally, these inflammable gases are exhausted from the furnace through the flue passageways in the heat exchanger, then up the vent to the exterior of the home.

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