To fix a Frigidaire front load washer displaying an E21 error code, you can try the following steps:
Unplug the washer from the power source for safety.
Check the drain hose and pump for any obstructions or clogs. Clear away any debris that may be preventing proper drainage.
Inspect the drain pump filter for any blockages. Clean the filter if it is dirty or clogged.
Verify that the drain pump is functioning properly. If the pump is faulty, it may need to be replaced.
Once the drain hose, pump, and filter are clear and in good condition, plug the washer back in and run a test cycle. If the error code persists, it is recommended to contact Frigidaire customer support or schedule a service appointment with a qualified technician for further assistance in diagnosing and repairing the issue.