Speed Queen Dryer: Igniter Glowing Red but No Flame -... | appliancefaults.com

Technical Background:

The dryer's Main Control Unit (MCU) sends 120V AC to the igniter, causing it to heat up. Once the igniter reaches a certain temperature, the MCU energizes the gas valve solenoids. The flame sensor monitors the presence of a flame and provides feedback to the MCU. A faulty flame sensor or MCU can prevent the gas valve from opening, even if the igniter is working.

Symptoms:

The homeowner reports that the Speed Queen dryer's igniter glows bright red, indicating it's receiving power and heating up, but the gas fails to ignite, and therefore no heat is produced in the dryer drum.

Possible Causes:

Faulty gas valve solenoid(s)
Defective flame sensor
Open high-limit thermostat
Blocked or restricted gas supply
Weak or failing igniter
Malfunctioning dryer control board (MCU)

Solution:

1

Disconnect power to the dryer at the breaker panel.
2

Remove the front panel of the dryer to access the burner assembly. Use a 1/4-inch nut driver.
3

Using a multimeter set to ohms, test the gas valve solenoids for continuity. A reading of infinity indicates an open solenoid. Replace the gas valve assembly if necessary.
4

Inspect the flame sensor for cracks or damage. Replace if necessary. Test its continuity when cold and after applying heat (use a lighter carefully), if the continuity does not change replace it.
5

Check the high-limit thermostat for continuity with a multimeter. An open circuit indicates a tripped thermostat; investigate the cause of overheating before replacing.
6

Verify the gas supply pressure with a manometer connected to the gas line test port. Normal pressure is around 3.5-4.5 inches of water column. Ensure the gas supply valve is fully open.
7

If all components test good, suspect a faulty dryer control board (MCU). Replace the board. Consider replacing the igniter at the same time.

Safety Warning:

Always disconnect power to the dryer at the breaker panel before performing any repairs. Gas appliances can be dangerous if not serviced properly. If you are not comfortable working with gas, contact a qualified appliance repair technician. Lock Out/Tag Out (LOTO) procedures MUST be followed to prevent accidental electrocution or gas leaks.

Prevention:

Clean the lint filter after every load. Periodically (every 6 months) inspect and clean the dryer vent duct to prevent lint buildup, which can cause overheating and component failure. Ensure proper gas supply and venting.

Expert Tip:

Some Speed Queen dryers have a service mode. Consult the service manual for the specific model. Accessing the service mode can provide error codes and component testing features that can aid in diagnosis. Typically this is activated by pressing a combination of buttons on the control panel.

Frequently Asked Questions

•What is the correct resistance range for the gas valve solenoids?

The resistance range for each gas valve solenoid should be between 1000 and 2000 ohms. Refer to the dryer's service manual for exact specifications.

•How do I test the high-limit thermostat and what should the reading be?

Disconnect power to the dryer. Remove the wires from the high-limit thermostat. Use a multimeter set to ohms. Touch the probes to each terminal of the thermostat. A reading of approximately zero ohms or a closed circuit indicates a good thermostat. An open circuit means the thermostat is tripped or faulty.

•Where can I find the service manual for my Speed Queen dryer?

You can usually find the service manual by searching online for your specific model number, followed by "service manual" or "repair manual." Some manufacturers also provide service manuals on their website. You may need to purchase it.

Speed Queen Dryer: Igniter Glowing Red but No Flame - Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the correct resistance range for the gas valve solenoids?

•How do I test the high-limit thermostat and what should the reading be?

•Where can I find the service manual for my Speed Queen dryer?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: