I've read the term numerous times but didn't know what it looked like or why it was called a "Sail Switch". It's a mystery no more.
What the sail switch does it ensure there's airflow before the furnace fires up the propane. The switch has an arm that reaches up into the furnace's blower. When the blower spins the air pushes against the switch arm. When the switch engages the furnace knows it is OK to fire up the propane. So if this switch goes bad the heater will not turn on the propane, but you'll hear the blower spin.
What the sail switch does it ensure there's airflow before the furnace fires up the propane. The switch has an arm that reaches up into the furnace's blower. When the blower spins the air pushes against the switch arm. When the switch engages the furnace knows it is OK to fire up the propane. So if this switch goes bad the heater will not turn on the propane, but you'll hear the blower spin.
Comment