Limit switch codes The limit switch shuts off the burner when the temperature exceeds a preset temperature. When the temperature reduces to normal, the burner will come back on. The most common reason for limits to open is a plugged filter or a dirty blower wheel.Click to see full answer. Also know, how do I know if my limit switch is bad on my furnace?If the high limit switch was bad, the furnace should not fire. When the high limit switch trips, the flame/heating element will be shut off and the blower will continue to run to clear the heat. The blower will continue to run until either the system is reset, or the limit switch closes.Similarly, can you bypass a limit switch? First, turn the power off to the furnace. If you have an ohmmeter, you can measure the resistance across the switch. If the temperature is below the setpoint, the resistance across the switch should be zero. If you do not have an electrical meter, you can temporarily bypass the switch and see if the furnace works. Subsequently, one may also 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.Can you reset a limit switch?Consult your instruction manual before resetting your furnace’s limit switch. The function of your furnace limit switch is to tell the fan when to turn off and on depending on the temperature in the home. It’s possible to reset the switch at home when necessary by following a few simple steps.
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