Roper Dryer Blowing Cold Air on Timed Dry: Troubleshootin... | appliancefaults.com

Technical Background:

The Roper dryer's main control unit (MCU) cycles power to the heating element through a series of safety devices like the thermal fuse and thermostats. The timer controls the overall cycle length, while the thermostats regulate the temperature. Voltage from the breaker panel (240V AC) passes through these components to the heating element. A break in the voltage path prevents the element from heating.

Symptoms:

The homeowner observes that the Roper dryer is running, the drum is turning, and the timer is advancing, but the air coming out of the dryer is cold, even on the timed dry setting. Clothes are not drying properly.

Possible Causes:

Faulty heating element
Defective thermal fuse
Malfunctioning thermostat
Blocked vent
Broken timer
Failed heating relay (on some models)

Solution:

1

Disconnect power to the dryer at the breaker panel.
2

Remove the rear access panel using a 1/4-inch nut driver.
3

Inspect the thermal fuse for continuity using a multimeter. It should read 0 ohms. Replace if open.
4

Check the heating element for continuity. A reading of approximately 9-13 ohms is normal. If open, replace the element.
5

Test the cycling thermostat for continuity. It should be closed at room temperature. Replace if open.
6

Verify proper venting by disconnecting the vent hose from the dryer and feeling for strong airflow. Clean the vent if restricted.
7

If equipped, test the heating relay for proper voltage when the dryer is running (approximately 240V AC across the terminals feeding the heating element). Replace if defective.

Safety Warning:

Disconnect power to the dryer at the breaker panel (Lock Out/Tag Out - LOTO) before performing any repairs. High voltage (240V AC) is present in the dryer, and improper handling can result in serious injury or death.

Prevention:

Regularly clean the lint trap after each load. Inspect and clean the vent hose annually to prevent blockages. Avoid overloading the dryer, as this can strain the heating element and other components.

Expert Tip:

On some Roper models, pressing and holding the 'Start' and 'Signal' buttons for 3 seconds will enter a diagnostic test mode. This can help identify specific component failures.

Frequently Asked Questions

•What is the correct resistance range for the heating element on my Roper dryer?

The heating element should typically read between 9 and 13 ohms. If the reading is significantly higher or shows an open circuit, the element is likely faulty.

•How do I test the thermal fuse on my Roper dryer?

Use a multimeter set to the continuity setting. Touch the probes to each terminal of the thermal fuse. A good thermal fuse should have continuity (a reading of approximately 0 ohms). If the multimeter displays an open circuit or 'OL', the fuse is blown and needs replacement.

•Where is the vent located in my Roper dryer and how do I clean it properly?

The vent is typically located at the rear of the dryer, where the exhaust hose connects. Disconnect the hose and use a vent brush or vacuum cleaner to remove any lint buildup. Also, inspect and clean the exterior vent opening to ensure proper airflow.

Roper Dryer Blowing Cold Air on Timed Dry: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the correct resistance range for the heating element on my Roper dryer?

•How do I test the thermal fuse on my Roper dryer?

•Where is the vent located in my Roper dryer and how do I clean it properly?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: