GE Dishwasher Error Code F21

F21 on a GE dishwasher means the rinse aid level in the dispenser reservoir has dropped too low. The dishwasher's sensor has detected insufficient rinse aid remaining. To resolve it, open the dispenser compartment on the inside of the door and refill it with liquid rinse aid. In most cases this clears the alert without any further action needed.

Resetting the dishwasher may temporarily clear the F21 display, but the alert will return if the underlying cause is not addressed. Since F21 is tied to an active low-level sensor reading, the correct fix is to refill the rinse aid reservoir rather than relying on a reset. Once the tank is refilled, the code should clear on its own after the next cycle.

If the issue is simply an empty reservoir, the only cost is the rinse aid itself, which typically runs between $4 and $15 depending on brand and quantity. If the dispenser cap needs replacement, parts generally range from $10 to $30. A faulty dispenser assembly requiring full replacement can cost between $30 and $80 for the part, plus labor if a technician is hired.

Start by refilling the rinse aid dispenser located on the inner door panel. Remove the cap, pour in rinse aid until the reservoir is full, replace the cap securely, and run a wash cycle. If the error reappears after confirmed refilling, inspect the dispenser cap for cracks and check that the dosage dial is not set unusually high. A persistent F21 after refilling may point to a faulty dispenser sensor requiring part replacement.

F21 is a low rinse aid warning, not a critical system fault, so the dishwasher will typically continue to operate. However, running without adequate rinse aid will result in poor drying performance and water spots on dishes and glassware. It is best to refill the rinse aid as soon as possible to maintain optimal wash results.