Originally posted by smithmr
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Mark,
A typical Suburban furnace has what is called a "three try" board. What that means is the furnace will attempt to light three times. If the board does not sense a flame after three times it goes into lockout mode.
When the board does not sense a flame (literally a voltage level fed back from a sensor) it could be there's no flame, the sensor is not in the flame, the sensor is faulty, or the board itself is bad.
To get the furnace out of lockout all that is required is to select OFF on the thermostat, wait a moment or two, and then go back to HEAT.
As Joseph asked, if you can provide the model of the furnace and thermostat we could possibly provide more information.
Howard
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