I have a Speed Queen washing machine.

The "Water Temperature" dial has three settings (Hot, Warm and Cold)
but only COLD water enters the tub.

Hot water comes out of the hot-water hose and cold water comes out of
the cold-water hose.

The water inlet valve is less than 9-months old but I've checked both
screens and they are clean. A continuity tester (i.e., multi-tester)
shows that both solenoids are OK. The inlet valve looks clean. How
can I check the inlet valve to see whether it's mechanically working
correctly?

If the inlet valve is working correctly, what else could prevent the
no-hot-water problem?