Whirlpool WFW5620HW IntelliFill Water Level Sensor... | appliancefaults.com

Technical Background:

The MCU (Microcontroller Unit) on the main control board receives a voltage signal from the water level sensor. This voltage varies based on the air pressure in the pressure hose, which corresponds to the water level in the tub. The MCU uses this data to control the water inlet valves and maintain the desired water level. Problems occur when the voltage signal is incorrect or misinterpreted.

Symptoms:

The washer either overfills, underfills, or displays an error code related to water level. The "IntelliFill" feature may not be working correctly, resulting in inconsistent water levels during different cycles.

Possible Causes:

Clogged pressure hose to the water level sensor.
Defective water level sensor.
Faulty wiring harness between the sensor and the main control board.
Air leak in the pressure hose system.
Software glitch in the main control board requiring recalibration.

Solution:

1

Disconnect power to the washing machine by unplugging it from the outlet.
2

Locate the water level sensor, usually near the bottom of the washer, accessed from the rear panel. Use a 1/4-inch nut driver to remove the panel.
3

Check the pressure hose connected to the sensor for kinks, clogs, or damage. Disconnect the hose and blow through it to ensure it's clear.
4

Reconnect the hose securely. Inspect the wiring harness connected to the water level sensor for any loose connections or damage.
5

Enter Service Mode: Press and hold the Start/Pause button, then press the Power button. Release both buttons. The control panel should illuminate.
6

Initiate IntelliFill calibration: In Service Mode, use the cycle selector knob to navigate to the IntelliFill calibration routine. Press Start/Pause to begin. The washer will automatically fill and calibrate the sensor.
7

Once calibration is complete, unplug the washer for 1 minute to reset the control board. Restore power and test the washer with a normal wash cycle.

Safety Warning:

Disconnect power to the appliance before performing any repairs. Lock-out/Tag-out (LOTO) procedures must be followed. Internal components may retain a high voltage charge even after the appliance is unplugged. Wear appropriate safety gear.

Prevention:

Periodically check the pressure hose for any signs of wear or damage. Avoid using excessive amounts of detergent, as this can contribute to clogs in the system. Run a cleaning cycle with a washer cleaner every month to prevent buildup.

Expert Tip:

If the calibration fails repeatedly, replace the water level sensor. Sometimes, a slightly defective sensor can still provide a signal, but it's inaccurate enough to prevent proper calibration.

Frequently Asked Questions

•How do I know if the water level sensor is actually defective?

Use a multimeter to check the resistance of the sensor. Consult the technical service manual for the specific resistance values at different water levels. An open circuit or significantly different resistance indicates a defective sensor.

•Where can I find the technical service manual for my Whirlpool WFW5620HW washer?

The service manual is available online through authorized Whirlpool parts distributors or appliance repair websites. You may need the model number to find the correct manual. Searching "Whirlpool WFW5620HW service manual" should yield results.

•What is the typical water fill level for the "Normal" wash cycle on this model?

The IntelliFill system automatically adjusts the water level based on the load size. However, for a medium-sized load, the water level should typically reach just below the bottom of the inner tub's top lip. Observe the water level during the fill cycle to ensure it aligns with your expectations for the load size.

Whirlpool WFW5620HW IntelliFill Water Level Sensor Calibration Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I know if the water level sensor is actually defective?

•Where can I find the technical service manual for my Whirlpool WFW5620HW washer?

•What is the typical water fill level for the "Normal" wash cycle on this model?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: