Roper Washer Not Finishing Cycle: Troubleshooting Guide... | appliancefaults.com

Technical Background:

The Motor Control Unit (MCU) monitors various sensors, including the pressure switch (water level), motor speed sensor, and temperature sensor. These sensors send voltage signals back to the MCU. If any signal is out of range or missing, the MCU interprets it as an error and reverts to the sensing stage. The MCU also controls the water inlet valve solenoids, the drain pump motor, and the drive motor via relays and triacs on the control board. Voltage to these components is typically 120V AC.

Symptoms:

The Roper washer starts a cycle but doesn't complete it. It repeatedly returns to the 'sensing' light, indicating it's trying to determine the load size but failing to move forward. The clothes remain wet, and the cycle never reaches the spin or drain phases.

Possible Causes:

Clogged Drain Pump Filter
Faulty Pressure Switch
Defective Water Inlet Valve
Failing Motor Control Unit (MCU)
Obstruction in the Drain Hose

Solution:

1

Unplug the washer from the 120V AC outlet.
2

Inspect and clean the drain pump filter. Use a 5/16-inch nut driver to access the pump.
3

Disconnect the pressure switch hose and check for clogs. Blow gently into the pressure switch – you should hear a click.
4

Test the water inlet valve solenoids for continuity with a multimeter. Resistance should be between 500-1500 ohms per coil.
5

Check the drain hose for kinks or obstructions.
6

Examine the wiring harness connecting the MCU to the motor and other components for any loose connections or damage.
7

If the above steps do not resolve the issue, the MCU may be faulty and require replacement.

Safety Warning:

Always disconnect power to the appliance before performing any repairs. Lock Out/Tag Out (LOTO) procedures should be followed. High voltage (120V AC) is present in the appliance.

Prevention:

Regularly clean the drain pump filter (every 3 months) to prevent clogs. Avoid overloading the washer. Use the correct amount of HE detergent.

Expert Tip:

Some Roper washers have a diagnostic mode. Typically, you can access it by pressing a specific sequence of buttons (e.g., Start/Pause, then Power, then Start/Pause again within 5 seconds). This will display error codes that can help pinpoint the problem.

Frequently Asked Questions

•What is the proper resistance reading for the drain pump motor?

The resistance reading for the drain pump motor should typically be between 5 and 20 ohms. An open circuit indicates a faulty motor.

•How do I test the pressure switch using a multimeter?

Disconnect the pressure switch. Use a multimeter to check continuity between the common terminal and the other terminals. With the hose disconnected, one terminal should show continuity. When you gently blow into the hose, the continuity should switch to a different terminal.

•Where is the Motor Control Unit (MCU) located on this Roper washer?

The MCU is typically located behind the control panel at the top of the washer. You'll need to remove the control panel to access it. Be careful not to damage any wiring during removal.

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the proper resistance reading for the drain pump motor?

•How do I test the pressure switch using a multimeter?

•Where is the Motor Control Unit (MCU) located on this Roper washer?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: