F1
Whirlpool Dishwasher
Severity: ModerateWhat Does This Error Mean?
The F1 error means the temperature sensor (thermistor) in your Whirlpool dishwasher has detected a problem. The dishwasher monitors water temperature throughout the wash cycle. If the reading is out of range or missing, the dishwasher stops to prevent poor cleaning or damage.
Affected Models
- WDT750SAHZ
- WDF520PADM
- WDT970SAHZ
- WDTA50SAHZ
- Most Whirlpool built-in dishwashers
Common Causes
- The temperature sensor (NTC thermistor) has failed and is giving an incorrect reading
- Wiring to the temperature sensor is loose, corroded, or broken
- The water inlet valve is not letting in enough hot water, causing low temperature readings
- The heating element has failed and is not raising the water to the expected temperature
- A software glitch on the control board is misreading the sensor data
How to Fix It
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Turn off the dishwasher and unplug it from the outlet or switch off the circuit breaker.
Wait 2 minutes, then restore power to perform a full reset.
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Run a new cycle and watch whether F1 returns immediately or after some time.
If it returns immediately, the sensor is likely failed. If it appears later in the cycle, the issue may be the heating element.
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Locate the temperature sensor — it is typically at the bottom of the dishwasher tub near the sump.
You'll need to remove the lower spray arm and filter assembly to access it.
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Test the sensor with a multimeter. At room temperature, it should read around 50,000 ohms.
If it reads open (infinite) or zero ohms, the sensor has failed and needs replacement.
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Replace the temperature sensor if it fails the test.
This is an affordable repair. The part costs $20–$50 and the replacement is straightforward.
When to Call a Professional
If the temperature sensor tests fine but the error persists, the heating element or control board may be at fault. A technician can use a diagnostic mode to identify exactly which component is failing. Temperature sensor replacement typically costs $20–$50 in parts.
Frequently Asked Questions
Will my dishes come out clean with the F1 error active?
No. The dishwasher will stop the cycle when F1 appears. Even if it runs partially, without the correct water temperature, cleaning and sanitizing performance will be poor.
Can low water temperature trigger F1?
Yes. If the water entering the dishwasher is too cold and the heating element cannot raise it to the target temperature within a set time, F1 can appear. Make sure your home's hot water heater is set to at least 120°F (49°C).
How do I access the temperature sensor in a Whirlpool dishwasher?
Remove the lower rack and unscrew the lower spray arm. Lift out the filter assembly to expose the sump area. The sensor is a small cylinder with two wires attached, plugged into the sump housing.