Yes, putting non-dishwasher safe dishes in a dishwasher can potentially damage the dishwasher. Dishwashers are designed to accommodate specific types of materials and dishes that can withstand the high temperatures, water pressure, and detergents used in the cleaning process. Non-dishwasher safe dishes may include items made of delicate materials such as wood, certain plastics, hand-painted ceramics, or items with decorative elements that can be damaged or fade in a dishwasher.
When non-dishwasher safe dishes are subjected to the intense heat and water pressure inside a dishwasher, they may warp, crack, or become discolored. Additionally, the detergent used in dishwashers may be too harsh for certain materials, causing them to deteriorate or lose their original appearance.
It's important to consult the manufacturer's instructions for each dish to determine whether it is dishwasher safe. If a dish is not labeled as dishwasher safe or if you're unsure, it's best to err on the side of caution and wash it by hand to avoid potential damage to the dishwasher or the dish itself.