Whirlpool WRX735SDHZ Refrigerator: "Filter" Message... | appliancefaults.com

Technical Background:

The refrigerator's main control unit (MCU) monitors the water filter status via a sensor or microswitch in the filter head. When the filter is new, the sensor or switch should signal the MCU to reset the filter timer. This signal is typically a change in voltage or a closed circuit. If the MCU does not receive this signal, it continues to display the filter replacement message.

Symptoms:

The Whirlpool WRX735SDHZ refrigerator displays the "Filter" or "Replace Filter" message even after a new water filter has been installed.

Possible Causes:

Incorrect filter system.
Faulty filter head microswitch.
Defective water filter status sensor.
Control board malfunction.
Wiring harness issue between the filter head and the control board.
Software glitch requiring a manual reset.

Solution:

1

Unplug the refrigerator or turn off the breaker at the breaker panel.
2

Remove and reinstall the water filter, ensuring it clicks securely into place. A loose fit can prevent the sensor from resetting.
3

Locate the filter head microswitch. Using a multimeter, test for continuity when the filter is installed. If there is no continuity when the filter is in place, the switch is likely defective and needs replacement.
4

Visually inspect the wiring harness and connections between the filter head and the main control board, looking for any signs of damage or corrosion. Repair or replace as needed.
5

Check the voltage to the filter sensor using a multimeter. Consult the wiring diagram to locate the correct pins. The voltage should be within the specified range (typically 5V DC) when the filter is installed.
6

Attempt a control board reset. Unplug the refrigerator for 5 minutes, then plug it back in.
7

As a last resort, if the problem persists after checking all components, the main control board may need replacement. Verify all other components before replacing.

Safety Warning:

Always disconnect power to the refrigerator before performing any repairs. Wear appropriate safety glasses and gloves. Some components may carry high voltage even after the refrigerator is unplugged.

Prevention:

Replace the water filter every 6 months, or as recommended by Whirlpool. Ensure the filter is properly installed each time. Periodically inspect the filter head area for any signs of water leaks.

Expert Tip:

On some Whirlpool models, you can manually reset the filter light by pressing and holding the "Light" and "Lock" buttons simultaneously for 3 seconds.

Frequently Asked Questions

•Where is the water filter status sensor located?

The water filter status sensor is typically integrated into the filter head assembly. It detects the presence and type of filter installed.

•What is the correct replacement filter for my WRX735SDHZ refrigerator?

The correct replacement filter is Whirlpool EveryDrop Filter 1 (part number W10295370A).

•How do I access the main control board?

The main control board is usually located behind an access panel at the rear of the refrigerator. Disconnect power before accessing the board. You may need a 1/4-inch nut driver to remove the panel screws.

Whirlpool WRX735SDHZ Refrigerator: "Filter" Message Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Where is the water filter status sensor located?

•What is the correct replacement filter for my WRX735SDHZ refrigerator?

•How do I access the main control board?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: