Maytag Dishwasher Error F1: Temperature Sensor Issue

The Logic Verdict

My Take: I reviewed the troubleshooting steps. The F1 error typically flags a water temperature issue—either the incoming water is too cold/hot, or the Temperature Sensor (Thermistor) is sending bad data to the control board. Before tearing the machine apart, verify your home’s water heater is set correctly (around 120°F) and run the hot water at the sink before starting a cycle.

What It Means

The F1 code stands for Temperature Sensor Fault or Water Temperature Out of Range.

Common Causes

1. Incoming Water Temp: Water entering the unit is below 110°F or above 170°F.
2. Faulty Temperature Sensor: The thermistor (often part of the turbidity sensor) has failed.
3. Wiring Issue: Corroded or loose connections at the sensor or control board.
4. Control Board Glitch: A temporary software error.

Step-by-Step Fix

1. Reset Power: Turn off the circuit breaker for the dishwasher for 1-2 minutes to clear any logic glitches.
2. Check Water Supply: Run the hot water at the kitchen sink until it is hot. Ensure your water heater is set to at least 120°F.
3. Access the Sensor: If the error persists, unplug the dishwasher or kill the power. Remove the lower kickplate (toe panel) held by two or four screws.
4. Locate the Sensor: Look for the temperature/turbidity sensor in the sump assembly (the white plastic basin at the bottom). It is usually a round device with a wire harness plugged into it, inserted directly into the sump.
5. Replace the Sensor:
   • Disconnect the wire harness.
   • Twist the sensor (usually a quarter-turn counter-clockwise) to unlock it.
   • Pull it straight out. (Be prepared for a little water to spill).
   • Lubricate the O-ring on the new sensor with a little water.
   • Insert and twist to lock it in place.
6. Reassemble: Reconnect the wires, replace the kickplate, and restore power.

Parts & Tools

• Maytag Dishwasher Temperature Sensor (Amazon Search)

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