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A sail switch is a switch inside the furnace that has a blade (or sail) attached to an arm that catches the air created by the running of the fan. This turns the switch on and allows the propane to be sent to the burner. This may not be the manufacturer's description but that's what it is. If the switch is bad (or stuck) it will not allow propane to flow. In our case, a technician told me to rap the side of the furnace with a rubber mallet and most times the switch will work. It did, it still does.
Orv
Orv
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