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What is model on the unit?I will see if I have a wiring diagram
Looking for a diagram
Do you have a white wire from fan to terminal block and the black connecting to a pink from molex plug on board?
Where are they currently connected?
THat should be wired properly
Make sure the orange wires are plugged onto the limit switch, An open limit can make room fan run
I do not have a listing on motor to see the 3rd connection.Is there a part number visible on motor?
All was working before you cleaned?
Sounds like for some reason relay on board is stuck in closed position telling fan to stay on.If you gently tap board will it go off?
Not sure what else to check I will open to other experts to see if they have further ideas.Sounds like board may be bad, but no reason for it to go out just by cleaning unit unless it got damp.
I am going to open to see if any of my colleagues have suggestions.