Roper Washer Sensing Light Flashing: Troubleshooting &... | appliancefaults.com

Technical Background:

The flashing sensing light typically indicates an error detected by the washer's Motor Control Unit (MCU). The MCU monitors various sensors, including the lid switch, pressure switch, and motor. Voltage fluctuations or incorrect readings from these components can trigger the error code and prevent the washer from starting. The MCU uses low voltage DC circuits (typically 5V DC) to monitor these components. When a component fails, the voltage level changes, which the MCU interprets as a fault.

Symptoms:

The Roper washer's sensing light is flashing continuously, and the machine will not start a wash cycle when the start button is pressed. The washer may be unresponsive to any user input.

Possible Causes:

Lid switch malfunction
Motor control unit (MCU) failure
Water inlet valve issue
Pressure switch problem
Wiring harness damage

Solution:

1

Unplug the washer from the 120V AC outlet.
2

Inspect the lid switch for proper operation. Use a multimeter to check for continuity when the lid is closed. Replace if faulty.
3

Check the water inlet valve screens for debris. Clean or replace if clogged.
4

Examine the pressure switch hose for kinks or blockages. Ensure the pressure switch is properly connected.
5

Visually inspect the wiring harness for any signs of damage, such as frayed wires or loose connections. Repair or replace as needed.
6

If the above steps don't resolve the issue, suspect a faulty MCU. Replace the MCU with a new, compatible unit.
7

After replacing any components, plug the washer back in and test the cycle.

Safety Warning:

Always disconnect power to the appliance before performing any repairs (Lock Out/Tag Out - LOTO). This appliance operates with 120V AC, which can cause serious injury or death. Exercise extreme caution.

Prevention:

Regularly clean the water inlet valve screens to prevent clogs. Avoid overloading the washer to prevent strain on the motor and other components. Periodically inspect the hoses and wiring for wear and tear.

Expert Tip:

Many Roper washers have a diagnostic mode. Consult the service manual for the specific key sequence to enter diagnostic mode. This can provide specific error codes that pinpoint the problem.

Follow-up Questions:

Frequently Asked Questions

•How do I test the lid switch with a multimeter?

With the washer unplugged, locate the lid switch. Set your multimeter to the continuity setting. Place one probe on each of the lid switch terminals. With the lid open, you should have no continuity (open circuit). With the lid closed (or manually depress the switch), you should have continuity (a closed circuit). If not, the switch is likely faulty.

•Where is the pressure switch located?

The pressure switch is typically located near the bottom of the washer cabinet, often attached to the frame. It's a small, round component with a hose connected to it. The hose runs to the bottom of the wash tub.

•What voltage should I expect to see at the water inlet valve?

When the washer is calling for water, you should measure 120V AC at the water inlet valve terminals. If you don't see this voltage, the issue could be with the wiring or the MCU.

Roper Washer Sensing Light Flashing: Troubleshooting & Fix

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I test the lid switch with a multimeter?

•Where is the pressure switch located?

•What voltage should I expect to see at the water inlet valve?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: