Whirlpool Dishwasher Error Code F9 E1: Long Drain Time... | appliancefaults.com

Technical Background:

The dishwasher's Main Control Unit (MCU) monitors the drain cycle time using a timer and a pressure sensor. If the drain cycle exceeds a predetermined time limit, and the pressure sensor indicates water is still present, the MCU throws the F9 E1 error. The MCU sends 120V AC to the drain pump motor via a relay. It also reads the water level using a pressure sensor. A faulty sensor or obstructed drain path can trigger this error.

Symptoms:

The dishwasher runs through its cycle, but it takes an unusually long time to drain the water. The F9 E1 error code appears on the display.

Possible Causes:

Clogged drain pump or filter
Kinked or blocked drain hose
Faulty drain pump motor
Defective pressure sensor
Issue with the dishwasher's control board
Air lock in the drain system

Solution:

1

Unplug the dishwasher or turn off the breaker.
2

Inspect the drain pump filter (usually at the bottom inside the tub). Remove any debris.
3

Check the drain hose for kinks or obstructions. Disconnect it from the sink drain or garbage disposal and blow through it to ensure it's clear.
4

Test the drain pump motor. Disconnect the wires to the drain pump. Use a multimeter to check continuity. A reading outside the manufacturer's specified range indicates a faulty pump. If you get no reading, the pump is bad.
5

Verify voltage to the drain pump during the drain cycle. Reconnect the dishwasher and start a cycle. Using a multimeter, test for 120V AC at the drain pump connector during the drain phase. No voltage indicates a control board issue.
6

Inspect the pressure sensor. If the pressure sensor is faulty, it may not accurately detect water levels and cause drain issues. Replacement may be necessary if testing reveals a fault.
7

If all other components test okay, the control board may be the problem. Replacement of the control board may be necessary.

Safety Warning:

Disconnect power to the dishwasher at the breaker panel before performing any repairs. Dishwashers use 120V AC, which can cause serious injury or death. Lock Out/Tag Out (LOTO) procedures are critical.

Prevention:

Regularly clean the drain pump filter. Ensure the drain hose isn't kinked or blocked. Run the dishwasher with a dishwasher cleaner monthly to prevent buildup.

Expert Tip:

Try running the dishwasher through a diagnostic cycle. Many Whirlpool dishwashers have a service mode that can help pinpoint the problem. To enter service mode, press and hold the 'High Temp Wash' and 'Heated Dry' buttons simultaneously for 3 seconds. The control panel will light up, and you can navigate through the tests using the same buttons.

Frequently Asked Questions

•What is the typical resistance reading I should see across a good drain pump motor?

A typical drain pump motor should show a resistance between 10 and 30 ohms. However, always refer to the specific model's service manual for the exact specifications.

•How do I access the drain pump on my Whirlpool dishwasher?

Typically, you can access the drain pump by removing the lower access panel at the front of the dishwasher. You might need a 1/4-inch nut driver to remove screws. After removing the panel, the drain pump is usually visible and accessible, often requiring a quarter turn to remove.

•Where is the pressure sensor located, and how can I test it?

The pressure sensor is generally located at the bottom of the dishwasher tub, often integrated with the sump assembly. You can test it using a multimeter to measure resistance while varying the water level. Refer to the service manual for the correct resistance values at different water levels.

Whirlpool Dishwasher Error Code F9 E1: Long Drain Time Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the typical resistance reading I should see across a good drain pump motor?

•How do I access the drain pump on my Whirlpool dishwasher?

•Where is the pressure sensor located, and how can I test it?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: