Amana Dishwasher Error Code 3-1: Water Sensor Thermistor... | appliancefaults.com

Technical Background:

error code 3-1 indicates a fault with the water sensor thermistor circuit. The main control unit (MCU) monitors the thermistor's resistance to determine water temperature. An open or shorted thermistor, or a wiring fault, will cause the MCU to flag the error. The MCU expects a specific voltage range from the thermistor, typically a varying DC voltage, based on temperature changes.

Symptoms:

The dishwasher displays error code 3-1. The dishwasher may not start, or may stop mid-cycle. Inconsistent water temperature readings are also possible. The homeowner may observe dishes not being cleaned properly.

Possible Causes:

Faulty thermistor.
Wiring harness issue.
Loose connection.
Damaged control board.
Excessive scaling or debris on the thermistor.

Solution:

1

Disconnect power to the dishwasher at the breaker panel. Verify 0V AC at the dishwasher junction box using a multimeter.
2

Locate the water sensor/thermistor, usually in the sump area.
3

Inspect the wiring harness and connector for damage, corrosion, or loose connections.
4

Use a multimeter to test the thermistor's resistance. Consult the Amana service manual for the correct resistance value at room temperature (typically around 77 degrees Fahrenheit). Replace if out of spec.
5

Check the control board for any signs of damage (burned components, corrosion). Replace the control board if damaged.
6

If the wiring and thermistor test good, but the error persists, suspect a software glitch. Try power cycling the dishwasher (unplugging for 5 minutes).
7

After repair, run a diagnostic cycle to ensure the error code is cleared and the dishwasher operates correctly.

Safety Warning:

Always disconnect power to the dishwasher before performing any repairs. Use proper lockout/tagout (LOTO) procedures. Be aware of potential shock hazards when working with electrical components. The junction box contains 120V AC wiring.

Prevention:

Use dishwasher cleaner regularly to prevent scaling and buildup on the thermistor. Avoid overloading the dishwasher to ensure proper water circulation. Inspect the spray arms regularly for clogs.

Expert Tip:

Some Amana dishwashers have a service mode. Consult the service manual for the specific model. Entering service mode allows you to run diagnostic tests and clear error codes. Often, pressing and holding the 'Start' and 'Heated Dry' buttons simultaneously for 5 seconds will activate this mode.

Frequently Asked Questions

•What is the typical resistance range for a healthy thermistor at room temperature (77 degrees F)?

The typical resistance range for a healthy thermistor at 77 degrees F is usually between 10k and 20k ohms. However, always refer to the specific service manual for the exact value for your Amana dishwasher model.

•Where is the control board located in an Amana dishwasher?

The control board is typically located behind the front control panel of the dishwasher. You will usually need to remove the outer and inner door panels to access it.

•Can I use a generic thermistor as a replacement, or do I need an OEM part?

It's always best to use an OEM (Original Equipment Manufacturer) thermistor to ensure proper compatibility and performance. A generic thermistor might have a different resistance curve, which could lead to inaccurate temperature readings and further problems.

Amana Dishwasher Error Code 3-1: Water Sensor Thermistor Fault Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the typical resistance range for a healthy thermistor at room temperature (77 degrees F)?

•Where is the control board located in an Amana dishwasher?

•Can I use a generic thermistor as a replacement, or do I need an OEM part?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: