Patch37, thank you for sharing your dishwasher experience with us. There are many conditions that can impact cleaning and drying, the most common being temperature. The “sweet” spot for water temperature is between 120-130 degrees for the best cleaning and drying potential. If you are uncertain if your water is the appropriate heat, check your water heater's temperature reading. To help get the hottest water to your dishwasher, let water run in your sink until it’s hot (like you do before getting in the shower). This "primes the pump", it gets hotter water to your dishwasher faster. Your dishwasher uses about 3-4 gallons per cycle, limiting the opportunity the water has to warm up if it doesn’t start off hot enough. Don’t forget to use rinse aid, it really makes a difference. Check to make sure the rinse aid dispenser is full. The dispenser window may show a dot to indicate its level, or it may function like a fuel gauge. Be sure to clean the filters regularly (page 16 in your Owner’s Manual). Selecting the heat dry option in combination with rinse aid will enhance drying performance. An i20 error code indicates clogged filters or a restricted drain line has been detected. Check and clean both filters and sump area, and check for a pinched or blocked drain hose. If the drain line is attached to a disposer, check that the knockout plug has been removed. The screeching sound you mentioned, is it happening when you open the door? If so, the pulley cables that operate the door may need to be rubbed with soap. If you have any questions, please reconnect with us directly for assistance. Your friendly Frigidaire lady, Ruth