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

Technical Background:

The dishwasher's Main Control Unit (MCU) monitors the turbidity sensor's voltage signal. The turbidity sensor measures the water's cleanliness by detecting the amount of light passing through it. If the voltage signal is out of range, the MCU will display error code 3-2. The voltage path typically runs from the MCU to the sensor, then back to the MCU. A break or short in this path can trigger the error.

Symptoms:

Homeowners report the dishwasher may not clean dishes properly, cycles may be longer than usual, or the dishwasher displays an error code 3-2.

Possible Causes:

Faulty turbidity sensor
Wiring harness issue between the sensor and the control board
Defective dishwasher control board (MCU)
Excessive food particles or debris interfering with sensor readings
Mineral buildup on the sensor
Loose connection at the sensor or control board

Solution:

1

Disconnect power to the dishwasher at the breaker panel.
2

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

Inspect the wiring harness and connector to the sensor for damage or loose connections. Re-seat the connector securely.
4

Use a multimeter to check the sensor's resistance. Refer to the Hotpoint service manual for the proper resistance range (typically between 1k and 5k ohms). If the resistance is outside the range, replace the sensor.
5

If the wiring and sensor appear good, inspect the dishwasher control board for any signs of damage (burnt components, etc.).
6

If the control board appears damaged or all other tests fail, replace the control board. Ensure you order the correct replacement part. You may need a 5/16-inch socket to remove the board.
7

After replacing parts, run a diagnostic cycle to confirm the error code is cleared.

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 to ensure the circuit remains de-energized. Some components may retain a charge; use caution. The control board operates on 120V AC.

Prevention:

Regularly clean the dishwasher's filter to prevent food particles from interfering with the turbidity sensor. Use a dishwasher cleaner every month to prevent mineral buildup.

Expert Tip:

Try entering the service mode by pressing and holding the 'Start' and 'Heated Dry' buttons simultaneously for 5 seconds. This may allow you to run a sensor calibration or diagnostic test to further isolate the issue.

Follow-up Questions:

Frequently Asked Questions

•What is the typical resistance range for a working turbidity sensor on a Hotpoint dishwasher?

The typical resistance range is between 1k and 5k ohms, but always refer to the specific Hotpoint service manual for your model.

•Where can I find the service manual for my Hotpoint dishwasher?

You can often find the service manual online by searching for your model number followed by 'service manual'. AppliancePartsPros.com and similar sites are good resources. You may also be able to order one from the manufacturer.

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

If the sensor tests within its specified resistance range and the wiring is intact, the control board is a likely culprit, but it's still good practice to double check for any less obvious wiring issues like shorts to ground before condemning the board. Control board failure can be caused by a power surge or by component degradation over time.

Hotpoint 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 for a working turbidity sensor on a Hotpoint dishwasher?

•Where can I find the service manual for my Hotpoint dishwasher?

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

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: