Kenmore Dishwasher: Blue Light Stays On, Cycle Won't... | appliancefaults.com

Technical Background:

The blue light is typically an indicator that the dishwasher is running. The Main Control Unit (MCU) manages the cycle progression and component activation. The voltage paths to the wash motor, drain pump, and water inlet valve are controlled by relays on the MCU. Faulty sensors or switches can send incorrect signals to the MCU, causing it to malfunction.

Symptoms:

The blue light projected on the floor stays on continuously, and the dishwasher cycle does not complete. The unit may stop mid-cycle or continue running without advancing to the next stage.

Possible Causes:

Faulty door latch switch.
Stuck or defective wash motor relay on the control board.
Water inlet valve failing to close completely.
Drain pump constantly running due to a faulty pressure switch or sensor.
Main Control Unit (MCU) software glitch or failure.
Wiring harness issue causing a short or open circuit.

Solution:

1

Disconnect power to the dishwasher at the breaker panel.
2

Check the door latch switch for continuity using a multimeter. It should show continuity when the door is closed and no continuity when open. Replace if faulty.
3

Inspect the water inlet valve for proper closure. Disconnect the water supply and check for any dripping or leakage. If leaking, replace the water inlet valve.
4

Examine the drain pump for obstructions or debris. Clear any blockages.
5

Access the main control board (MCU) and visually inspect for burned components or damaged traces.
6

Using a multimeter, check the voltage to the wash motor relay on the control board. It should only receive 120V AC when the wash cycle is active.
7

If the control board appears damaged or the relay is stuck, replace the entire control board.

Safety Warning:

Always disconnect power to the appliance at the breaker panel before performing any repairs. Lock Out/Tag Out (LOTO) procedures should be followed to prevent accidental re-energizing of the circuit. Dishwashers operate on 120V AC, which can be lethal.

Prevention:

Run a dishwasher cleaner cycle monthly using a dishwasher cleaner product. Periodically inspect the spray arms and filters for debris and clean as needed. Ensure proper water pressure to the dishwasher (at least 20 PSI).

Expert Tip:

Many Kenmore dishwashers have a service mode. Consult the tech sheet (usually located behind the kick panel) for instructions on accessing and using the service mode for error code retrieval and component testing. Some models can be reset by pressing the 'High Temp Wash' and 'Heated Dry' buttons simultaneously for 3 seconds.

Frequently Asked Questions

•How do I access the diagnostic mode on my Kenmore dishwasher?

Refer to the tech sheet located inside the dishwasher, usually behind the lower kick panel. It will outline the specific button sequence to enter the diagnostic mode. This mode allows you to view error codes and test individual components.

•What voltage should I expect to see at the water inlet valve?

You should see 120V AC at the water inlet valve when the dishwasher is calling for water during the fill cycle. If you measure 0V AC, check the wiring and the control board.

•Where can I find a replacement control board for my Kenmore dishwasher?

You can find replacement control boards at appliance parts retailers, both online and in local stores. Be sure to have your dishwasher's model number ready to ensure you order the correct part. Sears Parts Direct is often a good starting point for Kenmore parts.

Kenmore Dishwasher: Blue Light Stays On, Cycle Won't Finish - Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I access the diagnostic mode on my Kenmore dishwasher?

•What voltage should I expect to see at the water inlet valve?

•Where can I find a replacement control board for my Kenmore dishwasher?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: