Whirlpool Dishwasher Clean Light Blinking 5 Times:... | appliancefaults.com

Technical Background:

The main control unit (MCU) monitors the turbidity sensor signal. The turbidity sensor uses an optical sensor to measure the cloudiness (turbidity) of the water. The MCU uses this information to adjust the wash cycle time and water usage. If the MCU detects an abnormal signal from the turbidity sensor (e.g., out-of-range voltage or no signal), it triggers a fault code, indicated by the blinking clean light. The voltage path from the MCU to the sensor and back must be verified.

Symptoms:

The US homeowner observes that the Whirlpool dishwasher's clean light is blinking five times repeatedly. The dishwasher may not be cleaning properly, or it may not start a cycle at all. The blinking clean light occurs at the beginning or during the wash cycle.

Possible Causes:

Faulty turbidity sensor
Wiring harness issue between the sensor and the control board
Defective main control board
Clogged or dirty turbidity sensor
Water supply issues affecting sensor readings

Solution:

1

Disconnect power to the dishwasher at the breaker panel. Use a voltage tester to confirm the power is off.
2

Locate the turbidity sensor, usually in the sump area of the dishwasher tub. It is often held in with a retaining clip or twist lock.
3

Inspect the wiring harness and connections to the turbidity sensor for damage or corrosion. Repair or replace as needed. Use a wire stripper/crimper and butt connectors for repairs.
4

Using a multimeter, test the turbidity sensor for proper resistance according to the service manual (typically between 1k and 10k ohms). Set your multimeter to ohms (Ω).
5

Check the water inlet valve to ensure adequate water flow to the dishwasher. Low water pressure can affect the sensor reading. The valve should read approximately 120V AC when energized.
6

If the sensor tests bad, replace it with a new Whirlpool-approved turbidity sensor. If the wiring and sensor test good, the main control board may be faulty and require replacement.
7

Restore power to the dishwasher and test the operation by running a short wash cycle.

Safety Warning:

Always disconnect power to the dishwasher at the breaker panel before performing any repairs. Confirm the power is off using a non-contact voltage tester. Dishwashers operate on 120V AC, which can cause serious injury or death.

Prevention:

Regularly clean the dishwasher filter to prevent debris from clogging the turbidity sensor. Avoid using excessive amounts of detergent, as this can also affect sensor readings. Periodically run a dishwasher cleaning cycle with a commercial dishwasher cleaner.

Expert Tip:

Many Whirlpool dishwashers have a service mode that can be accessed by pressing a specific sequence of buttons. Refer to the service manual to learn how to enter service mode and run diagnostic tests on the turbidity sensor.

Frequently Asked Questions

•What is the specific resistance range I should be looking for on the turbidity sensor?

Refer to the service manual for your specific model. However, a typical range for a good turbidity sensor is between 1k and 10k ohms at room temperature.

•How do I access the dishwasher's service mode?

The service mode access varies by model. Usually, it involves pressing a sequence of buttons on the control panel (e.g., High Temp Scrub, Heated Dry, High Temp Scrub, Heated Dry). Consult the service manual or search online for your specific model's procedure.

•Where is the turbidity sensor located inside the dishwasher?

The turbidity sensor is typically located in the sump area, near the bottom of the dishwasher tub. You may need to remove the lower spray arm and filter assembly to access it.

Whirlpool Dishwasher Clean Light Blinking 5 Times: Turbidity Sensor Fault Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the specific resistance range I should be looking for on the turbidity sensor?

•How do I access the dishwasher's service mode?

•Where is the turbidity sensor located inside the dishwasher?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: