Alfred G Kansas City , MO March 02, 2015 Appliance: Model WHIRLPOOL DUET HT WFW9200SQA12. Intermittent f20 error code Replaced inlet water valve, cleaned build up on detergent drawer and cleaned out pump filter. No error code so far, (10 loads so far.) Hardest part was unstacking washer and dryer to open to panel of washer. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes