Amana Dishwasher Error Code 3-2: Turbidity Sensor... | appliancefaults.com

Technical Background:

The Amana dishwasher's MCU monitors the turbidity sensor, which measures the cloudiness or clarity of the wash water. The sensor outputs a voltage signal that varies depending on the water's turbidity. The MCU interprets this voltage and adjusts the wash cycle accordingly. Error 3-2 indicates that the MCU is receiving an unexpected or invalid signal from the turbidity sensor.

Symptoms:

Homeowners typically report that the dishwasher stops mid-cycle, displays error code 3-2, and the dishes may not be thoroughly cleaned.

Possible Causes:

Faulty turbidity sensor
Wiring harness issue between the sensor and the control board
Defective main control board (MCU)
Clogged or dirty turbidity sensor
Low water pressure affecting sensor readings
Excessive suds interfering with the sensor

Solution:

1

Disconnect power to the dishwasher at the breaker panel.
2

Locate the turbidity sensor, typically in the sump area of the dishwasher. You may need a 1/4-inch nut driver to remove the lower access panel.
3

Inspect the sensor for visible damage or debris. Clean the sensor gently with a soft brush.
4

Check the wiring harness and connector to the turbidity sensor for loose connections or damage. Use a multimeter to test the continuity of the wiring.
5

With the dishwasher still disconnected from power, use a multimeter to test the resistance of the turbidity sensor itself, comparing it to the manufacturer's specifications (if available). An open circuit or very high resistance usually indicates a faulty sensor.
6

If the sensor and wiring appear to be good, the main control board (MCU) may be defective. Replacing the control board is a more advanced repair.
7

Reconnect power and run a test cycle to see if the error code clears.

Safety Warning:

Always disconnect power to the dishwasher at the breaker panel before performing any repairs. Lock Out/Tag Out (LOTO) procedures should be followed. Some components may retain a charge even after power is disconnected.

Prevention:

• Use the correct amount of dishwasher detergent. Avoid over-sudsing.
• Regularly clean the dishwasher filter to prevent debris buildup.
• Ensure adequate water pressure to the dishwasher (minimum 20 PSI).

Expert Tip:

On some Amana models, you can enter service mode by pressing the 'High Temp' and 'Air Dry' buttons simultaneously, followed by pressing 'Start'. This allows you to run diagnostic tests on individual components, including the turbidity sensor.

Frequently Asked Questions

•What is the typical resistance range I should expect from a functioning turbidity sensor?

Unfortunately, there is no standard resistance value for turbidity sensors. The resistance varies greatly between manufacturers and even models within the same brand. Consult the specific service manual or technical sheet for your Amana dishwasher model to find the correct resistance range.

•How can I determine if low water pressure is affecting the turbidity sensor?

You can measure the water pressure at the water inlet valve of the dishwasher using a water pressure gauge. It should be at least 20 PSI. Also check the fill time of the dishwasher. If it takes an excessively long time to fill, it could indicate a low water pressure issue.

•If the turbidity sensor tests good, what's the likelihood that the control board is the problem?

If the turbidity sensor tests within the expected range and the wiring is intact, the control board is a likely culprit, but not a certainty. Before replacing the control board, double-check all wiring connections to the board and look for any signs of corrosion or damage on the board itself. Also, consider any recent electrical events like power surges that may have damaged the board.

Amana Dishwasher Error Code 3-2: Turbidity Sensor Failure Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the typical resistance range I should expect from a functioning turbidity sensor?

•How can I determine if low water pressure is affecting the turbidity sensor?

•If the turbidity sensor tests good, what's the likelihood that the control board is the problem?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: