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Sail switch. They are finicky things and can get stuck open with cat and dog fur, dust, hair, etc..... Jump the switch terminals with a paper clip for 15 seconds while the fan is running to see if the furnace lights. I keep an extra one in my tool kit just in case. You can try to blow it out with a spray cleaner in a pinch. Sometimes you have to bend the sail ever so slightly to force the switch to close, but not so much that the sail hits the fan.
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