Whirlpool Dishwasher Sump Drain Hose Leaking: Repair... | appliancefaults.com

Technical Background:

The Whirlpool dishwasher's MCU (Main Control Unit) activates the drain pump to remove water from the wash tub through the sump and drain hose. Voltage is typically 120V AC to the drain pump motor. A leak in the drain hose system will result in water escaping before reaching the drain line.

Symptoms:

US homeowner observes water leaking from under the dishwasher, particularly during the drain cycle. May also notice standing water in the dishwasher after a cycle.

Possible Causes:

Loose hose clamp
Cracked or damaged drain hose
Deteriorated sump housing connection
Mineral buildup preventing a tight seal
Improper hose system or routing
Worn or damaged drain pump O-ring (less common)

Solution:

1

Disconnect power to the dishwasher at the breaker panel.
2

Locate the sump drain hose connection beneath the dishwasher. You may need to remove the lower access panel.
3

Carefully inspect the hose, clamp, and sump connection for visible damage or mineral buildup.
4

Use a 5/16-inch nut driver or hose clamp pliers to loosen the hose clamp. If the clamp is damaged, replace it.
5

Disconnect the drain hose from the sump. Check the hose for cracks or swelling. Replace if necessary. Also check the sump outlet for damage.
6

Clean the sump connection and the inside of the hose with a brush and mild detergent to remove any mineral buildup.
7

Reconnect the drain hose to the sump, ensuring it is fully seated. Secure the hose clamp tightly. Ensure the hose is not kinked or pinched.

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 prevent accidental energizing of the circuit. The drain pump operates on 120V AC; avoid contact with electrical components when power is on.

Prevention:

Regularly inspect the drain hose and connections for any signs of wear or damage. Avoid using excessive amounts of detergent, which can contribute to mineral buildup. Run a dishwasher cleaner with citric acid monthly.

Expert Tip:

A small amount of silicone grease applied to the sump connection can help ensure a tight seal and prevent future leaks. Also, check the dishwasher's service manual for the error code associated with a drain failure, as this can provide additional diagnostic information.

Frequently Asked Questions

•What type of hose clamp should I use to replace the original?

Use a stainless steel hose clamp of the correct size for the drain hose. A worm-gear clamp is generally suitable.

•How do I access the sump area on my Whirlpool dishwasher?

Typically, you'll need to remove the lower access panel, which is held in place by screws. You may also need to remove the kick plate. Refer to your dishwasher's service manual for specific instructions.

•If the hose and clamp look okay, what else could be causing a leak in that area?

The sump housing itself may be cracked or damaged. Carefully inspect the sump for cracks, especially around the drain hose connection point. If cracked, the entire sump assembly will need to be replaced.

Whirlpool Dishwasher Sump Drain Hose Leaking: Repair Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What type of hose clamp should I use to replace the original?

•How do I access the sump area on my Whirlpool dishwasher?

•If the hose and clamp look okay, what else could be causing a leak in that area?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: