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Hello, so far it sounds like a printed circuit card going bad, that would be true if it operated with a main blower delay earlier, but now it operates without a delay.
Let me know about that detail, we can go from there.
Thanks, the manual for that unit does not include the wiring diagram.
without a printed circuit board it might be simply a bad Fan limit switch.
Please attach a well focused, close up photo of the wiring diagram glued inside the service panel, the picture needs to be taken from straight on, in very good light.
You can use the paper clip- icon at the right end of the tool bar at the top of this dialog box to attach it here.
If there is no paper clip-icon, look for the '+attach files' link at left of your send button.
I can mark it up with trouble shooting instructions.
We can go from there.