Whirlpool Washer Lid Lock Bypass: Diagnostic Testing... | appliancefaults.com

Technical Background:

The MCU sends a 120V AC signal to the lid lock solenoid to engage the lock. Once locked, a signal is sent back to the MCU confirming the lock status, allowing the wash cycle to continue. A bypass involves tricking the system into thinking the lock is engaged, typically for diagnostic purposes.

Symptoms:

US homeowner observes the washer not spinning, filling, or starting, often accompanied by a lid lock error light. The lid appears closed, but the washer doesn't proceed with the wash cycle.

Possible Causes:

Faulty lid lock switch
Broken lid strike or actuator
Wiring harness damage or loose connections to the lid lock
Malfunctioning MCU (Main Control Unit) not sending the lock signal
Obstruction preventing proper lid closure
Blown fuse or tripped breaker supplying power to the washer

Solution:

1

Unplug the washer from the outlet.
2

Locate the lid lock assembly. It's typically on the washer top, near the lid.
3

Disconnect the wiring harness connector from the lid lock.
4

Using a multimeter, check for 120V AC at the lid lock connector when the washer is supposed to be in the spin cycle. If no voltage is present, inspect the wiring harness for breaks and check the breaker panel for tripped breakers.
5

Manually activate the lid lock switch using a small magnet. If the washer now operates (with extreme caution!), the lid lock itself is likely faulty.
6

Inspect the lid strike for damage. Replace if damaged.
7

If voltage is present at the lid lock connector but the lock doesn't engage with the magnet test, replace the lid lock assembly.

Safety Warning:

Lock Out/Tag Out (LOTO) the washer by unplugging it from the outlet before performing any diagnostic or repair work. High voltage is present within the appliance; exercise caution.

Prevention:

Regularly inspect the lid strike for damage and ensure the lid closes smoothly. Avoid slamming the lid shut.

Expert Tip:

Many Whirlpool washers have a diagnostic mode. Simultaneously press and hold the Start/Pause and Cycle Signal buttons for 3 seconds to enter diagnostic mode. This can display error codes related to the lid lock.

Frequently Asked Questions

•What is the resistance I should expect to measure across the lid lock switch terminals when the lid is locked?

You should expect to see a resistance close to 0 ohms when the lid lock switch is closed, indicating continuity. When the lid is unlocked, you should see infinite resistance or an open circuit.

•If the MCU is not sending voltage to the lid lock, what are the possible causes?

Possible causes include a faulty MCU, a problem with the wiring harness between the MCU and the lid lock, or another sensor input that is preventing the MCU from initiating the lock sequence. Check all other sensors, such as the water level sensor, for proper function.

•What is the correct part number for the lid lock assembly for my specific Whirlpool washer model?

To determine the correct part number, you will need to locate the model number of your washer. It's typically located inside the lid or on the back panel. Once you have the model number, you can search online appliance parts retailers or contact Whirlpool directly to get the correct part number.

Whirlpool Washer Lid Lock Bypass: Diagnostic Testing Guide with Magnet

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the resistance I should expect to measure across the lid lock switch terminals when the lid is locked?

•If the MCU is not sending voltage to the lid lock, what are the possible causes?

•What is the correct part number for the lid lock assembly for my specific Whirlpool washer model?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: