Hotpoint Dishwasher Loud Growling Noise During Drain... | appliancefaults.com

Technical Background:

The Main Control Unit (MCU) signals the drain pump via a solid-state relay. This relay, typically a TRIAC, allows 120V AC power to flow to the drain pump motor when the drain cycle is initiated. The MCU monitors current draw from the pump. Excessive current or a lack of current can trigger fault codes (although the user reports no fault code in this case). The drain pump uses an impeller to force water out of the dishwasher tub and into the drain hose.

Symptoms:

The homeowner reports a loud, growling or grinding noise emanating from the Hotpoint dishwasher during the drain cycle. The noise is persistent throughout the drain operation and louder than normal dishwasher operation.

Possible Causes:

Foreign object lodged in the drain pump impeller.
Worn or damaged drain pump motor bearings.
Partially blocked drain hose causing excessive strain on the pump.
Defective drain pump motor.
Failed or failing drain pump capacitor.

Solution:

1

Disconnect power to the dishwasher at the breaker panel.
2

Remove the lower access panel of the dishwasher using a 1/4-inch nut driver.
3

Locate the drain pump. It's usually at the bottom of the dishwasher, near the sump.
4

Inspect the drain pump for any visible obstructions. Remove any debris, such as glass shards or food particles. A small set of needle-nose pliers can be helpful.
5

Disconnect the drain hose from the pump. Check the hose for kinks or blockages. Flush it with water to ensure clear passage. Measure the hose diameter - typically 5/8 inch to 3/4 inch inner diameter.
6

Using a multimeter, check the drain pump motor windings for continuity. Resistance should be a few ohms. An open circuit indicates a failed motor.
7

Reconnect power and briefly initiate the drain cycle. Use a multimeter to verify 120V AC is reaching the drain pump terminals. If voltage is present but the pump doesn't run (after clearing obstructions), replace the drain pump.

Safety Warning:

Always disconnect power to the appliance before performing any repairs. Lock Out / Tag Out (LOTO) procedures should be followed. Dishwashers operate on 120V AC, which can cause serious injury or death. Consult a qualified technician if you are not comfortable performing electrical repairs.

Prevention:

Regularly clean the dishwasher filter to prevent food particles from entering the drain pump. Avoid placing large or sharp objects in the dishwasher that could damage the pump.

Expert Tip:

Many Hotpoint dishwashers have a service diagnostic mode. Typically, you can access this by pressing a specific sequence of buttons (e.g., Heated Dry - Normal Wash - Heated Dry - Normal Wash). Consult the service manual for the exact sequence for your model. This mode can run component tests, including the drain pump.

Follow-up Questions:

Frequently Asked Questions

•What is the typical lifespan of a dishwasher drain pump?

A typical dishwasher drain pump lasts approximately 5-10 years, depending on usage and water quality. Hard water and frequent use can shorten its lifespan.

•Can I replace the drain pump myself, or should I call a professional?

Replacing the drain pump is a moderately difficult task. If you are comfortable with basic appliance repair and electrical safety, you can likely do it yourself. Otherwise, it is recommended to call a professional.

•Where can I find the correct replacement drain pump for my Hotpoint dishwasher?

You can find the correct replacement drain pump by searching online using your dishwasher's model number. Appliance parts retailers like AppliancePartsPros.com or RepairClinic.com are good resources. Make sure the part is compatible with your specific model number.

Hotpoint Dishwasher Loud Growling Noise During Drain Cycle: Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the typical lifespan of a dishwasher drain pump?

•Can I replace the drain pump myself, or should I call a professional?

•Where can I find the correct replacement drain pump for my Hotpoint dishwasher?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: