I would advise against putting water or any other liquid into your dishwasher's rinse aid dispenser just to make the indicator light go out. The rinse aid dispenser is designed to hold and dispense a specific liquid rinse aid, which serves an essential purpose in the dishwasher's cleaning process.
The rinse aid helps to improve the drying performance and reduce water spots and streaks on your dishes by facilitating water runoff. It also helps to prevent mineral deposits from forming on the dishes during the drying cycle. Using the rinse aid as intended can significantly enhance the overall performance of your dishwasher and result in cleaner and more spot-free dishes.
If the rinse aid indicator light is on, it likely means that the rinse aid is running low or empty. Instead of filling the dispenser with water, it's better to purchase the appropriate rinse aid solution and fill the dispenser with the recommended product. This will ensure your dishwasher operates efficiently and delivers the best cleaning results.
Using water instead of the appropriate rinse aid may not provide the same benefits, and your dishes might not dry properly, leading to water spots and streaks. Additionally, it could potentially cause damage to your dishwasher or affect its performance in the long run. Therefore, always follow the manufacturer's guidelines and use the appropriate products for your dishwasher to maintain its optimal functionality.