F21Serious
Frigidaire Dishwasher F21 Error Code
The flood switch has been activated due to excessive water in the base pan. This is a critical error to prevent water damage.
Common causes
- Leaking water valve or hose
- Cracked tub or sump
- Faulty flood switch (false alarm)
How to fix it
- Unplug dishwasher and turn off water supply.
- Remove all standing water from base pan with a towel or sponge.
- Inspect for obvious leaks under the dishwasher.
⚠ When to call a pro: Call a technician immediately to diagnose the leak source; do not operate until fixed.
▶ Watch repair videos
🔧 Find the part · Flood switch (if false) or leak source part (e.g., hose, sump)
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Always unplug the appliance (and turn off the water for washers/dishwashers) before inspecting. These guides are for information only and are not a substitute for a professional repair.