Roper Dryer Taking Too Long to Dry: Troubleshooting... | appliancefaults.com

Technical Background:

The dryer's MCU (Main Control Unit) monitors temperature via thermistors. These sensors provide feedback to the MCU, which then controls the heating element or gas valve. If the thermistor readings are incorrect or if the MCU detects a fault, it may limit or prevent heating, extending drying times. Voltage paths supply power to the heating element, motor, and control circuits. A voltage drop can also cause poor performance.

Symptoms:

The homeowner observes that their Roper dryer is taking an excessive amount of time to dry towels and heavy loads of laundry. Even after multiple cycles, clothes remain damp.

Possible Causes:

Restricted vent or exhaust duct.
Faulty heating element or gas valve.
Defective thermostat or thermistor.
Clogged lint filter.
Incorrect voltage supply.
Weak blower motor.

Solution:

1

Unplug the dryer from the power outlet. Always disconnect power before servicing.
2

Inspect the vent and exhaust duct for blockages. Disconnect the duct from the dryer and the wall. Use a vent brush or vacuum to remove lint and debris. Ensure the duct is not crushed or kinked.
3

Test the heating element for continuity using a multimeter. Disconnect the wires to the heating element. Set the multimeter to ohms. A reading of infinity indicates a failed element. Replace if necessary.
4

Check the thermostat and thermistor. Locate these components near the blower housing. Use a multimeter to measure resistance. Compare readings to the manufacturer's specifications. A common reading at room temperature (70°F) for a thermistor might be around 10k ohms. A faulty thermostat won't show continuity.
5

Verify the voltage supply to the dryer. Use a multimeter to measure voltage at the outlet. For electric dryers, you should see approximately 240V AC between the two hot legs and 120V AC from each leg to neutral. Gas dryers need 120V AC.
6

Inspect the blower wheel for obstructions. Access the blower housing (usually requires removing the front panel). Ensure it spins freely. Debris can restrict airflow.
7

Clean the lint filter thoroughly after each use.

Safety Warning:

Disconnect power to the dryer at the breaker panel before performing any repairs. Use Lock-Out/Tag-Out (LOTO) procedures to prevent accidental re-energization. High voltage is present in electric dryers – use extreme caution.

Prevention:

Regularly clean the lint filter after each load. Inspect and clean the exhaust duct at least once a year. Avoid overloading the dryer.

Expert Tip:

Some Roper dryers have a diagnostic mode. Consult the service manual to access this mode. It may display error codes or allow you to run component tests to diagnose the issue more effectively. Often, holding down a specific combination of buttons for a few seconds will enter the diagnostic mode. Consult service manual.

Frequently Asked Questions

•What is the proper resistance range for the thermistor on my Roper dryer?

The resistance of the thermistor varies with temperature. Consult the dryer's service manual for a resistance chart that specifies the expected resistance at different temperatures. At room temperature (around 70°F), a typical thermistor might read approximately 10k ohms.

•How do I access the heating element on my Roper dryer?

Accessing the heating element usually involves removing the rear panel of the dryer. You'll need a 1/4-inch nut driver or screwdriver. Be sure to disconnect the power supply before you begin, and wear appropriate safety gear.

•What size vent hose should I use for my Roper dryer?

Use a 4-inch diameter rigid metal vent hose for optimal airflow and safety. Avoid flexible plastic or foil hoses, as they can trap lint and increase the risk of fire.

Roper Dryer Taking Too Long to Dry: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the proper resistance range for the thermistor on my Roper dryer?

•How do I access the heating element on my Roper dryer?

•What size vent hose should I use for my Roper dryer?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: