Pylon told not for the D13 , what that mean?
While the Nano has an LED directly over a resistor on D13, the UNO has an opamp in between.
I use this pin D13 and D12 to test a contact and it is going to ground. is it the problem?
Depends on the schematics but from your short description I would say it's a problem for the Nano but not for the UNO. Post your wiring diagram!
i think there a problem on the supply, near CC at this time over 9v on the main supply (12v normaly).
I don't find the context for this sentence. Please explain in more detail.