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The B1141702 is a genuine OEM fan center relay engineered for the Goodman GUP100-4A gas furnace and compatible units. It combines the blower control relay and 24V control transformer functions into a single assembly, switching line-voltage blower operation on a low-voltage thermostat signal. When your furnace blower fails to energize on a call for heat or cooling, a failed fan center is one of the most common culprits.
This is a true Goodman OEM component built to factory tolerances for exact fit, correct contact rating, and reliable low-voltage pickup. Aftermarket universal fan centers can work but often require rewiring and lack the guaranteed terminal layout of the original. For a plug-and-play repair that preserves your warranty, the OEM part is the safe choice.
Moderate — Requires disconnecting power, labeling and transferring low- and line-voltage wiring, and mounting the relay. A confident DIYer can complete it in 20–30 minutes; if you are unsure about the wiring diagram, hire a licensed HVAC technician.