Error Code F3: Troubleshooting Whirlpool Dishwashers

Introduction

Whirlpool Dishwasher Error Code f3 is an indication of a thermistor error. The thermistor plays a critical role in measuring the water temperature inside your dishwasher. When this component malfunctions, it can result in inaccurate temperature readings, leading to the F3 error code. In this article, we will provide a comprehensive troubleshooting guide to help you diagnose and resolve this issue, as well as offer tips to prevent future occurrences. By following our step-by-step instructions, you can ensure your dishwasher remains in optimal working condition.

Identifying the Error:

When troubleshooting Whirlpool dishwasher error codes it’s crucial to accurately identify the issue before proceeding with the troubleshooting steps. In the case of Error Code F3, which indicates a thermistor error, understanding the underlying problem is essential.

The thermistor is a temperature sensor that measures the water temperature and heating system inside your dishwasher. It plays a vital role in ensuring the dishwasher operates at the appropriate temperature for effective cleaning and rinsing. When the thermistor malfunctions, it can result in inaccurate temperature readings and trigger Error Code F3.

To identify the error, you can rely on the error code displayed on the dishwasher’s control panel. In this case, Error Code F3 specifically points to a thermistor problem. However, it’s important to note that error codes can vary depending on the dishwasher model, so consulting your appliance’s user manual can provide accurate information for your specific model.

Once you’ve identified the error as a thermistor issue, you can proceed with the troubleshooting steps outlined in the previous section to diagnose and resolve the problem. By following these steps systematically, you can effectively troubleshoot the error and restore your Whirlpool dishwasher to its optimal functioning state.

Checking the Thermistor:

To troubleshoot Error Code F3 on your Whirlpool dishwasher, which indicates a thermistor error, it is necessary to check the thermistor and its related components. Here is a step-by-step guide on how to perform the necessary checks:

• Safety Precautions: Before starting any troubleshooting procedure, ensure the dishwasher is unplugged or disconnected from power to prevent electrical shock or injury.
• Access the Control Board: To access the control board and thermistor, remove the outer door panel of the dishwasher. Refer to the user manual or manufacturer’s instructions for detailed guidance on panel removal specific to your dishwasher model.
• Locate the Thermistor: The thermistor is typically connected to the control board through a harness or connection. Identify the thermistor, which is a small device with wires attached to it, usually located near the bottom of the dishwasher tub.
• Check the Wiring and Connections: Inspect the harness/connection between the thermistor and the control board for any loose or damaged connections. Ensure that all connections are securely plugged in and properly seated.
• Measure Resistance: Using a multimeter, measure the resistance between the designated pins on the thermistor. Refer to the manufacturer’s specifications or the provided table in the diagnostic procedure for the expected resistance values at different temperatures. A normal thermistor should give a reading between 30,000 to 50,000 ohms at room temperature (approximately 20-25°C or 68-77°F). If the reading is outside this range, consider replacing the thermistor. 
• Compare Resistance Values: Compare the measured resistance with the expected resistance values for the corresponding temperature. Connect the multimeter leads to the thermistor’s terminals. If the measured resistance falls within the specified range, the thermistor is functioning correctly. Proceed to the next troubleshooting step.
• Replace the Thermistor: If the measured resistance is outside the expected range or doesn’t match the specified values, it indicates a faulty thermistor. In this case, the thermistor needs to be replaced. Consult your dishwasher’s user manual or contact the manufacturer for the appropriate replacement part.
• Reassemble and Retest: After replacing the thermistor, reassemble the dishwasher by reattaching the outer door panel. Plug in the dishwasher or reconnect the power supply. Run a test cycle or start the dishwasher to verify if the error code has been resolved.

Inspecting the Wiring:

In addition to checking the thermistor itself, it is crucial to inspect the wiring and connections associated with the thermistor when troubleshooting Error Code F3 on your dishwasher. Here’s a detailed guide on how to inspect the wiring:

• Safety Precautions: Prior to conducting any inspections, ensure that the dishwasher is unplugged or disconnected from the power source to avoid electrical hazards.
• Access the Control Board: Remove the outer door panel of the dishwasher to gain access to the control board and wiring. Refer to the user manual or manufacturer’s instructions for the specific procedure required for your dishwasher model.
• Locate the Wiring: Identify the wiring harness or connections that link the thermistor to the control board. These connections are usually secured with plugs or connectors.
• Visual Inspection: Carefully examine the wiring harness and connectors for any signs of damage, such as frayed wires, loose connections, or corrosion. Ensure that all connections are tightly secured and free from debris or foreign objects.
• Check Continuity: Using a multimeter set to the continuity or resistance mode, test the continuity of the wiring. This will help identify any breaks or interruptions in the wiring. Touch one probe of the multimeter to each end of the wire or connection and check if there is a continuous flow of electricity.
• Repair or Replace: If any wiring issues are detected, such as loose connections or damaged wires, repair or replace the affected components. For loose connections, reconnect them securely. If wires are damaged beyond repair, replace them with new ones of the appropriate gauge.
• Reassemble and Retest: After addressing any wiring issues, reassemble the dishwasher by reattaching the outer door panel. Plug in the dishwasher or reconnect the power supply. Run a test cycle or start the dishwasher to see if the Error Code F3 has been resolved.

By thoroughly inspecting the wiring and ensuring proper connections, you can eliminate any potential wiring-related problems that may trigger Error Code F3 on your dishwasher.

Checking the Control Board:

If all previous checks have been done and the thermistor and wiring are functioning properly, it’s essential to examine the control board of your dishwasher. The control board is responsible for coordinating the various functions and components of the dishwasher. Here’s a step-by-step guide on how to check the control board:

• Safety First: Before working on the control board, ensure the dishwasher is unplugged or disconnected from the power source to prevent electrical accidents.
• Access the Control Board: Remove the outer door panel of the dishwasher to gain access to the control board. Refer to the user manual or manufacturer’s instructions for the specific procedure for your model.
• Visual Inspection: Carefully inspect the control board for any visible signs of damage, such as burnt marks, charred components, or loose connections. These indications may suggest a faulty control board that requires replacement.
• Testing the Output: Using a multimeter set to DC voltage mode, check the output voltage of the control board that connects to the thermistor. Locate connector P10 on the control board and measure the voltage between pins P10-5 and P10-6. The reading should be approximately 5V DC. If there is no voltage or the reading is significantly different, it indicates a control board malfunction.
• Replace the Control Board: If the control board shows signs of damage or the voltage readings are incorrect, replacing the control board is recommended. Ensure you have the correct replacement part compatible with your dishwasher model. Consult the user manual or contact the manufacturer for specific instructions on replacing the control board.

By thoroughly inspecting the control board and testing its output, you can identify any potential issues that may be causing Error Code F3 on your dishwasher. If the control board is determined to be the problem, replacing it should resolve the error and restore the dishwasher’s functionality.

Testing the Heater:

If you’ve checked the thermistor, wiring, and control board and are still experiencing Error Code F3 on your dishwasher, it’s important to test the heater. The heater is responsible for heating the water in the dishwasher to the appropriate temperature for effective cleaning. Here’s a step-by-step guide on how to test the heater:

• Safety Precautions: Before performing any tests, ensure that the dishwasher is unplugged or disconnected from the power source to avoid electrical hazards.
• Locate and Access the Heating Element: The heating element is typically located at the bottom of the dishwasher tub, near the sump assembly. It is a long, tubular component with electrical connections at both ends. To access the element, remove the lower panel or kick plate at the front of the dishwasher. Consult your dishwasher’s user manual for specific instructions on panel removal.
• Inspect the Element: Carefully examine the element for any signs of visible damage, such as discoloration, cracks, or breaks. If you notice any physical damage, the element is likely faulty and needs to be replaced.
• Check for Continuity: Using a multimeter set to the resistance or continuity mode, test for continuity in the element. Touch one probe of the multimeter to each terminal of the element. If there is continuity, it means the element is functioning properly. If there is no continuity, it indicates a faulty element that requires replacement.
• Replace the Heating Element: If the element is physically damaged, shows no continuity, or has resistance values outside the specified range, it needs to be replaced. Consult your dishwasher’s user manual or contact the manufacturer for the appropriate replacement part.
• Reassemble and Retest: After replacing the heating element, reassemble the lower panel or kick plate. Plug in the dishwasher or reconnect the power supply. Run a test cycle or start the dishwasher to check if Error Code F3 has been resolved.

By testing the heater and ensuring its proper functioning, you can eliminate any potential issues related to the heating element that may trigger Error Code F3 on your dishwasher.

Conclusion:

Troubleshooting Error Code F3 on a Whirlpool dishwasher requires a systematic approach. Start by checking the thermistor and its resistance. Inspect the wiring for any issues or faults. If both the thermistor and wiring are fine, examine the control board and heating element for damage or malfunctions. Prioritize safety throughout the process. By following these steps, you can effectively diagnose and resolve the thermistor error on your dishwasher. For genuine OEM replacement parts make sure to check out our website by clicking here.