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The B1370724 is a genuine OEM Goodman ignition control module engineered for the GDX100-5 series gas furnace. This board manages the ignition sequence, monitors flame sense, and coordinates gas valve and blower timing to keep your furnace firing safely and reliably. When a furnace fails to light, short-cycles, or locks out, a failed ignition module is one of the most common causes.
This is the factory OEM board, not an aftermarket substitute. OEM modules guarantee exact firmware timing and connector fitment, which protects downstream components like the gas valve and inducer. Generic boards can save money up front but may require rewiring, mismatch flame-sense sensitivity, and risk nuisance lockouts.
Rating: Moderate. A DIY-capable homeowner can replace it in 30-45 minutes with basic hand tools, but 120/24V wiring is involved. Always cut power at the furnace disconnect, photograph the wiring before removal, and confirm proper grounding. If you are not comfortable working around gas and line-voltage circuits, use a licensed HVAC technician.