Roper Gas Dryer Igniter Glows But Flame Won't Stay Lit:... | appliancefaults.com

Technical Background:

The Roper dryer's Main Control Unit (MCU) sends 120V AC to the igniter. The igniter glows and draws current. When the igniter reaches sufficient temperature, a flame sensor detects the heat and signals the MCU to open the gas valve. If the flame sensor doesn't detect the flame or the gas valve fails to stay open, the flame is extinguished. The voltage path includes the igniter, flame sensor, gas valve coils, and the MCU.

Symptoms:

The Roper gas dryer cycles on, the igniter glows orange, but the burner fails to ignite or the flame extinguishes shortly after ignition. Clothes remain damp after a complete cycle.

Possible Causes:

Faulty flame sensor
Defective gas valve coils
Blocked vent or exhaust duct
Weak or failing igniter (not drawing enough amps)
Defective dryer control board (MCU)
Low gas supply pressure

Solution:

1

Disconnect power to the dryer at the breaker panel.
2

Locate the flame sensor near the burner assembly. Disconnect and test for continuity using a multimeter. A good sensor should show continuity. Replace if open.
3

Access the gas valve. Visually inspect the two coils for damage. Using a multimeter, test each coil for resistance. Refer to the dryer's service manual for the correct resistance range. Replace the gas valve assembly if either coil is outside the specification.
4

Inspect the dryer vent and exhaust duct for lint buildup. Clean thoroughly to ensure proper airflow. Confirm the vent run is less than 25 feet with no more than two 90-degree elbows.
5

Verify proper gas pressure at the gas valve. A manometer should read around 3.5-4.0 inches of water column.
6

If the flame sensor, gas valve, and venting are all good, the igniter might be weak and not drawing enough amperage. Use an amp meter and test the amperage draw on the igniter. The dryer's schematic diagram should have the correct amperage rating. Replace the igniter if the amperage draw is low.
7

If the flame sensor, gas valve, venting, and igniter are all good, the control board (MCU) may be faulty. Replacement may require licensed technician assistance and programming.

Safety Warning:

Disconnect power to the dryer at the breaker panel before performing any repairs (Lock Out, Tag Out - LOTO). Gas appliances operate on 120V AC and natural gas; both can be lethal. If you are not comfortable working with gas or electricity, contact a qualified technician.

Prevention:

Clean the lint filter after every load. Inspect and clean the exhaust duct at least once a year to prevent lint buildup. Schedule licensed technician dryer maintenance annually.

Expert Tip:

Many Roper dryers have a diagnostic mode. Consult the service manual for the specific key sequence to activate it. Error codes displayed can help pinpoint the faulty component.

Frequently Asked Questions

•What is the typical resistance range for the gas valve coils?

The resistance range varies by model, but typically falls between 1200-1400 ohms per coil. Refer to the dryer's service manual for the exact specification.

•How do I safely test the gas pressure at the gas valve?

Disconnect power to the dryer. Locate the pressure test port on the gas valve. Attach a manometer and turn on the gas supply to the dryer. Observe the pressure reading. Shut off the gas supply and carefully disconnect the manometer.

•Where is the flame sensor located on my Roper dryer?

The flame sensor is typically located near the burner assembly, often mounted on a bracket near the igniter. It's a small, rod-shaped sensor positioned to detect the burner flame.

Roper Gas Dryer Igniter Glows But Flame Won't Stay Lit: Troubleshooting Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the typical resistance range for the gas valve coils?

•How do I safely test the gas pressure at the gas valve?

•Where is the flame sensor located on my Roper dryer?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: