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If you disconnected the thermostat leads at the furnace and the furnace is not in an open limit circuit condition then you probably do have a stuck fan relay. Tapping on the relay won't necessarily free it up.
Replace the relay
Give me a few to review the manual.
The manual shows an ECM motor. This muddies the water. Do you have an ECM motor on your unit?
Refer to page 19 in the manual. It shows an eight pin molex connector on the fan control board which also has the thermostat terminals strip.
Ok, now see i you have the same thing on your unit
Ok then if your unit has the same board you have an ECM motor. Diagnosing an ECM motor issue is not a DIY project.
Given the cost of the components invloved (an ECM control is sevral hundred minimum) and the expertise invleved you're better off leaving this to a pro.
ECM motors are a different animal. The fan controller is what controls the fan.
That's what it looks like from here based on what you're telling me.
You can't replace a relay on the board.
You're just thowing parts at it. A diagnostic by a pro is typically around $100.
I can't make a referral. Try a referral service like HomeAdviser.com. There is no charge to you for their service. Specify your furnace brand in your service request