Washer stops and displays F03 or F3, may not advance from wash to rinse, sometimes with very hot or cold water behavior.

Safety first: Unplug the washer and shut off both hot and cold water supplies before accessing internal components.

Step-by-step:

• Locate the NTC sensor: On most Whirlpool front-loaders, the NTC is mounted in the heater housing or directly in the outer tub near the heater at the bottom front or rear.
• Inspect wiring: Check the connector at the NTC for corrosion, loose pins, or broken wires. Reseat the connector firmly.
• Test the sensor: Remove the connector and measure resistance across the NTC terminals with a multimeter. At room temperature (~68°F/20°C), many Whirlpool NTCs read around 9–15 kΩ (check your tech sheet for exact values). Resistance should change smoothly when warmed (e.g., by holding in your hand).
• Check for shorts: Verify there is no continuity between either NTC terminal and ground (tub or chassis). Any continuity indicates a short.
• Inspect heater (if present): If the model has a tub heater, test it for proper resistance and for shorts to ground. A shorted heater can cause erroneous temperature readings.
• Replace faulty parts: If the NTC is out of spec or intermittent, replace it. If wiring and NTC are good but F03 persists, the main control board may have a failed temperature circuit and need replacement.

When to call a technician: If you are not comfortable testing resistance or accessing the heater/NTC area, or if the control board is suspected, professional service is recommended.