F21Whirlpool Dishwasher
Whirlpool Dishwasher Error F21 – Meaning, Causes & How to Fix
The appliance detected cooling or ventilation fan is not operating.
Medium Severity
Low
Medium
High
Critical
Expert Verified
Reviewed by a Certified Electrical Engineer & Licensed Technician
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Official Meaning
The appliance detected cooling or ventilation fan is not operating.
Real-World Causes
- 1Power surge affecting electronics
- 2Loose wiring harness
- 3Blocked filter or hose
- 4Mechanical obstruction in pump or motor
- 5Failed sensor component
Symptoms
Look for these signs to confirm error F21 on your Whirlpool Dishwasher:
- Look for these signs to confirm F21 on your
- Whirlpool WDT730PAHZ:
- Cycle stops unexpectedly
- Appliance fails to start program
- Display immediately shows error code
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DIY Fix (Safe)
- 1Power cycle the appliance for 5 minutes
- 2Inspect hoses, filters, and accessible sensors
- 3Verify household power and water supply conditions
- 4Run appliance diagnostic mode if available
Professional Action Required
- 1Test electrical components with multimeter
- 2Inspect wiring harness and connectors
- 3Replace defective sensor, pump, motor, or control board if required
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Additional Context
Frequently Asked Questions
What does Whirlpool Dishwasher error F21 mean?
The appliance detected cooling or ventilation fan is
not operating.
What causes Whirlpool Dishwasher F21 error?
Common causes include: Power surge affecting electronics, Loose wiring
harness, Blocked filter or hose.
How do you fix Whirlpool Dishwasher error F21?
Start with these DIY steps: Power cycle the appliance for 5 minutes. Inspect
hoses, filters, and accessible sensors. If the error persists, professional service may be needed.
Related Error Codes
Other Whirlpool Dishwasher Errors
F01The appliance detected the thermistor reading is
outside expected range
F02The appliance detected the heating element circuit is
malfunctioning
F03The appliance detected insufficient or restricted water
entering the appliance
F04The appliance detected water level exceeded safety
threshold
F05The appliance detected cooling or ventilation fan is
not operating
F11The appliance detected cooling or ventilation fan is
not operating
F18The appliance detected cooling or ventilation fan is
not operating
F22The appliance detected cooling or ventilation fan is
not operating
About the Author
Technical Review Team
Reviewed by certified appliance technicians with 10+ years of Whirlpool repair experience. Every error code is verified against manufacturer service manuals and real-world repair data.