Whirlpool Washer - F40 Error Code
Water level or pressure system error.
Meaning
Water level or pressure system error.
The F40 error indicates that the washer’s pressure system is not providing valid water level information. Whirlpool Duet washers use a pressure switch or analog pressure sensor to monitor water level. If the sensor output is missing, out of range, or inconsistent with the washer’s fill stage, the washer triggers F40. This error is less common but typically indicates a failing pressure sensor or wiring issue.
Symptoms
Causes
Step-by-Step Fixes
- Inspect the pressure hose for blockages.
- Ensure the hose is firmly connected.
- Test the pressure sensor with a multimeter.
- Replace the sensor if readings are out of range.
Safety Notes
- Disconnect power before servicing the pressure system.
Applicable Models
Show Models
- WFW9200SQ
- WFW9400SW
Related Pages
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- Whirlpool Washer F41 Error Code
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- Whirlpool Washer F5 E2 Error Code
- Whirlpool Washer F5 E3 Error Code
- Whirlpool Washer F5 Error Code
- Whirlpool Washer F51 Error Code
- Whirlpool Washer F52 Error Code
- Whirlpool Washer F54 Error Code
- Whirlpool Washer F6 E3 Error Code
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- Whirlpool Washer F7 E7 Error Code
- Whirlpool Washer F7 Error Code
- Whirlpool Washer F72 Error Code
- Whirlpool Washer F73 Error Code
- Whirlpool Washer F8 E1 Error Code
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- Whirlpool Washer F8 Error Code
- Whirlpool Washer F83 Error Code
- Whirlpool Washer F84 Error Code
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- Whirlpool Washer LOC Error Code
- Whirlpool Washer SUD Error Code
- Whirlpool Washer SUDS Error Code
Model-Specific Notes
On Duet models, F40 often appears when the pressure hose becomes partially blocked by detergent residue or lint.
Disclaimer
The information provided on this page is for educational and informational purposes only. Repairs involve electrical, mechanical, and water-related risks. Always follow manufacturer instructions and consider contacting a qualified technician for diagnosis or repair.