Dishwasher doesn't wash with hot water

Question

Hello - this may be a dumb question...i purchased a used dishwasher for my rental property and the tenants have reported that it only washes in cold water. Is there something i need to do to enable the hot water? I'll have to check exactly what model the dishwasher is when i drop by tonight...in the meantime...any ideas? i really know NOTHING about dishwashers :(