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An ignitor heats up to light the gas burner when the system calls for heat. The flame sensor proves that a flame is present so the control board knows it is safe to keep the gas valve open.
Specifications
- Part number: 00-424194-00001
- Brand: Vulcan Hart
- Part type: Ignitor/flame sensor assembly
- Height: 2.95 in / 7.49 cm
- Length: 8.95 in / 22.73 cm
- Width: 3.8 in / 9.65 cm
- Volts: must be the same, often 120 V
- Material: silicon carbide or nitride, as listed
- Shape and mount: must fit the same bracket
From the maker's and parts sellers' listings for this number. Compare them with the label on your old part.
How the Ignitor and Flame Sensor Work
The ignitor draws power to get hot enough to light the incoming gas. If the ignitor is cracked or worn out, the system will try to start, but the gas will never ignite.
Once the gas lights, the flame sensor checks that the fire actually started. If the burners light and then go out after 3 to 10 seconds, a dirty or faulty flame sensor is a common cause. Never bypass a flame sensor, because it is an essential safety device.
Understanding the Part Dimensions
Physical size is critical for proper alignment with the gas burner and mounting brackets. The listed dimensions for part number 00-424194-00001 include the following exact measurements:
- Height: 2.95 in / 7.49 cm
- Length: 8.95 in / 22.73 cm
- Width: 3.8 in / 9.65 cm
How to Confirm a Replacement Matches
When you check a replacement part, compare it carefully to the original unit you removed from the equipment. The volts must match the original system requirement, which is often 120 V.
The material must match the design, whether it uses silicon carbide or silicon nitride. Silicon nitride igniters last longer than silicon carbide igniters. Finally, the overall shape and mounting base must fit the existing bracket so the element sits at the correct angle next to the burner.
Safe Removal and Installation Steps
Careful preparation keeps the installation safe and prevents damage to the brittle heating element.
- Turn off the power at the breaker and shut off the manual gas supply valve.
- Take a photo of every wire connection before unplugging anything.
- Carefully loosen the mounting screws holding the assembly to the bracket.
- Remove the old assembly without bumping surrounding metal surfaces.
- Position the new assembly into place, taking care not to touch the element with bare fingers.
- Secure the mounting screws and reconnect the wires one at a time to match your photo.
Read your old part
- Turn off all power and locate the label or stamped number on the metal bracket of your existing part.
- Clean away any surface soot gently with a dry cloth to make the text readable.
- Check that the stamped part number matches 00-424194-00001 directly.
- Compare the bracket layout, height, length, and width to ensure the physical dimensions match your old assembly.
When to call a pro
Working on gas equipment involves fire and fuel risks. Gas valve work means opening gas lines and setting gas pressure, which a licensed tech should do. Hire a licensed HVAC technician for any step you are not sure you can do safely.
Questions
Why should I avoid touching the ignitor element with my bare hands?
Igniters are brittle and sensitive to contamination. Skin oil left on the element can create hot spots and shorten the life of the part.
What happens if the flame sensor fails?
A flame sensor proves there is a flame. If the burners light and then shut off after 3 to 10 seconds, a dirty or failing flame sensor is a common cause.
Can I bypass the flame sensor to keep my equipment running?
No. Never bypass a flame sensor, limit switch, or other safety control. These devices protect your equipment and home from dangerous gas buildup.
What should I do if I smell gas while checking the part?
If you smell gas, do not touch any electrical switch. Leave the building immediately and call your gas company from outside.
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