Roper Dryer Drum Light Flashing When Door Closed:... | appliancefaults.com

Technical Background:

The Roper dryer uses a main control unit (MCU) to manage all functions, including the drum light. The door switch signals the MCU when the door is open or closed. The MCU then controls the voltage to the drum light. A flashing light usually indicates the MCU is receiving conflicting or erroneous signals.

Symptoms:

The drum light in your Roper dryer is flashing continuously even when the door is closed. The dryer may or may not operate normally otherwise.

Possible Causes:

Faulty door switch
Defective main control unit (MCU)
Loose wiring connection to the door switch or MCU
Short circuit in the drum light circuit
Stuck relay on the MCU controlling the drum light
Incorrect voltage to the MCU

Solution:

1

Disconnect power to the dryer at the breaker panel.
2

Locate and inspect the door switch. Use a multimeter to check for continuity when the door is closed and open. Replace if faulty.
3

Check wiring connections to the door switch and the MCU. Look for loose wires or corrosion. Repair or replace as needed.
4

Access the MCU (usually located behind the control panel). Visually inspect for burned components.
5

With the power restored (use caution!), use a multimeter to check the voltage at the MCU power input. It should be 120V AC. If it is low or absent, check the wiring from the breaker panel.
6

If the voltage is correct and the door switch is good, the MCU is likely the problem. Replace the MCU.
7

After repairs, test the dryer operation.

Safety Warning:

Always disconnect power to the appliance at the breaker panel before performing any repairs. Lock Out/Tag Out (LOTO) procedures should be followed to prevent accidental re-energization. The dryer operates on 120V AC and 240V AC – exercise extreme caution.

Prevention:

Periodically inspect and clean the lint filter. Ensure proper ventilation to prevent overheating. Check the door switch for proper operation every 6 months.

Expert Tip:

On some Roper dryers, you can enter a diagnostic mode by pressing and holding the Start/Pause and Signal buttons simultaneously for 3 seconds. This may display error codes or allow you to test individual components.

Frequently Asked Questions

•Where is the door switch located on my Roper dryer?

The door switch is typically located near the door opening, either on the cabinet frame or on the dryer door itself. It's usually a small plastic switch that is activated when the door is closed.

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

Set your multimeter to the continuity setting (the ohm symbol). Place one probe on each terminal of the door switch. With the door open, the multimeter should show no continuity (an open circuit). With the door closed, the multimeter should show continuity (a closed circuit).

•What if the drum light stays on even with a new door switch?

If the drum light remains on after replacing the door switch, the MCU is likely faulty and needs to be replaced. There could also be a short circuit in the wiring harness for the light itself.

Roper Dryer Drum Light Flashing When Door Closed: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Where is the door switch located on my Roper dryer?

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

•What if the drum light stays on even with a new door switch?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: