Hooked up washer and the drain and water is behind the washer on the wall upstairs I noticed a leaking water on our ceiling downstairs on the
Main floor but there is no water on the floor upstairs. Could a pipe in the wall be leaking where the hot cold hookups are and drain? Should I call a plumber?

Is the drain and supply pipes inside a box mounted in the wall.(washer hookup box)

Is the drain and supply pipes inside a box mounted in the wall.(washer hookup box)

Yes

Pipes to and from the box can leak but the fittings on the box can leak too. If your ceiling is dried out try this, let the washer fill but not run. Don't want the drain to be wet yet. Let me know if your leak appears.

Pipes to and from the box can leak but the fittings on the box can leak too. If your ceiling is dried out try this, let the washer fill but not run. Don't want the drain to be wet yet. Let me know if your leak appears.

When the washer fills there is dripping on the ceiling. There is also dripping on the hot cold valves.