Maytag Dishwasher: Identifying Wash Motor vs.... | appliancefaults.com

Technical Background:

The Maytag dishwasher's Main Control Unit (MCU) controls the wash motor and circulation pump. The MCU sends 120V AC to the wash motor via a relay. If the motor fails to respond, the MCU may trigger an error code (if equipped with a display) or extend the cycle time. Voltage paths are typically fused for protection.

Symptoms:

The homeowner reports a loud grinding, rattling, or humming noise coming from the dishwasher during the wash cycle. The dishes may not be cleaned properly, or the cycle may take longer than usual.

Possible Causes:

Worn wash motor bearings
Foreign object obstructing the impeller
Defective circulation pump
Low water pressure affecting pump performance
Damaged pump housing creating vibration
Clogged filter restricting water flow to the pump

Solution:

1

Disconnect power to the dishwasher at the breaker panel (LOTO).
2

Remove the lower spray arm and inspect for debris.
3

Check the dishwasher filter for clogs and clean thoroughly.
4

Access the wash motor assembly (usually located under the bottom rack). Use a 1/4-inch nut driver to remove any access panels.
5

Disconnect the wash motor electrical connector. Use a multimeter to check for 120V AC at the connector when the dishwasher is running a wash cycle. If voltage is present, the motor is receiving power.
6

Carefully inspect the wash motor and circulation pump for any visible damage or leaks.
7

If the motor appears damaged or excessively noisy when manually rotated, replace the wash motor assembly.

Safety Warning:

Always disconnect power to the dishwasher at the breaker panel before performing any repairs. Use Lock-Out Tag-Out (LOTO) procedures to prevent accidental re-energizing of the circuit. High voltage (120V AC) is present in the dishwasher.

Prevention:

Regularly clean the dishwasher filter (at least once a month). Avoid placing large food particles in the dishwasher. Run a dishwasher cleaner cycle with vinegar or a commercial dishwasher cleaner every 3 months.

Expert Tip:

Most Maytag dishwashers have a service mode. To access it, try pressing the 'High Temp Wash' and 'Heated Dry' buttons simultaneously for 3 seconds while the dishwasher is in standby mode. This allows you to run diagnostic tests on the wash motor and other components.

Frequently Asked Questions

•How do I determine if the noise is definitely coming from the wash motor versus another component?

Isolate the sound. Run a short cycle and carefully listen near the bottom of the dishwasher. If possible, use a mechanic's stethoscope to pinpoint the source of the noise.

•What is the typical lifespan of a Maytag dishwasher wash motor?

The average lifespan is 5-7 years, but this can vary depending on usage and water quality. Hard water can shorten the life of the motor.

•Can I replace just the wash motor or do I need to replace the entire pump assembly?

It depends on the model. Some dishwashers allow you to replace the motor separately, while others require you to replace the entire pump assembly. Check the parts diagram for your specific model.

Maytag Dishwasher: Identifying Wash Motor vs. Circulation Pump Noise

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I determine if the noise is definitely coming from the wash motor versus another component?

•What is the typical lifespan of a Maytag dishwasher wash motor?

•Can I replace just the wash motor or do I need to replace the entire pump assembly?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: