Hotpoint Washer Error Code 4: Water Temperature Sensor... | appliancefaults.com

Technical Background:

error code 4 in Hotpoint washers typically indicates a problem with the water temperature sensor circuit. The MCU (Microcontroller Unit) on the control board monitors the voltage signal from the thermistor. This thermistor's resistance changes with water temperature. The MCU interprets this resistance to regulate the water temperature. If the MCU detects an out-of-range voltage, it triggers error code 4.

Symptoms:

The washer displays error code 4 on the control panel. The water temperature may be incorrect, the washer may not heat the water at all, or the cycle may be interrupted.

Possible Causes:

Faulty water temperature sensor (thermistor).
Loose or corroded wiring connections to the sensor.
Wiring harness damage between the sensor and the control board.
Defective control board (MCU).
Open circuit in the sensor wiring.
Short circuit in the sensor wiring.

Solution:

1

Disconnect power to the washer by unplugging it from the outlet or turning off the breaker. Use a multimeter to check the outlet; confirm 120V AC.
2

Locate the water temperature sensor. It's typically near the heating element or water inlet valve. Consult the washer's service manual for its exact location.
3

Inspect the wiring connections to the sensor for any signs of corrosion or looseness. Clean or tighten as needed.
4. Disconnect the sensor and use a multimeter to measure its resistance. Compare the reading to the value specified in the service manual at room temperature (usually around 77 degrees Fahrenheit). Replace the sensor if the reading is significantly off.
4

Check the wiring harness between the sensor and the control board for any damage. Repair or replace the harness if necessary.
5

If the sensor and wiring are good, the control board may be the problem. Visually inspect the control board for burnt components. Consider replacing the control board.
6

Reconnect the power and run a test cycle to verify that the error code is gone.

Safety Warning:

Disconnect power to the appliance before performing any repairs. High voltage is present inside the washer. Use proper lockout/tagout (LOTO) procedures to ensure the power remains off during the repair. Wear appropriate personal protective equipment (PPE), such as safety glasses and gloves.

Prevention:

Regularly inspect wiring connections for corrosion. Avoid overloading the washer, which can stress components. Use the correct amount of detergent.

Expert Tip:

Some Hotpoint washers have a diagnostic mode. To enter, typically you press and hold the start button for 3 seconds, then rapidly rotate the cycle selector knob 3 clicks clockwise and 1 click counter-clockwise within 5 seconds. Error codes will be displayed. Check the service manual for the exact sequence for your specific model.

Frequently Asked Questions

•What is the typical resistance range for the water temperature sensor at room temperature?

The resistance typically ranges from 10,000 to 20,000 ohms at 77 degrees Fahrenheit. Refer to the service manual for the exact specification for your model.

•How do I access the water temperature sensor on my Hotpoint washer?

Access typically requires removing the top panel or the rear panel of the washer. Refer to the service manual for specific disassembly instructions for your model.

•Where can I purchase a replacement water temperature sensor or control board?

You can purchase replacement parts from appliance parts retailers online or at local appliance repair stores. Be sure to provide the model number of your washer to ensure you get the correct part.

Hotpoint Washer Error Code 4: Water Temperature Sensor Failure Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the typical resistance range for the water temperature sensor at room temperature?

•How do I access the water temperature sensor on my Hotpoint washer?

•Where can I purchase a replacement water temperature sensor or control board?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: