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The Goodman B1141702 is a genuine OEM fan center relay assembly for the GUP075-3A gas furnace. A fan center combines a 24V relay and an integrated control transformer in one housing, providing the low-voltage power and blower switching your furnace needs to operate the indoor fan on heating and cooling calls. When the blower won't start—or runs continuously—a failed fan center is a frequent culprit.
The genuine OEM B1141702 matches the factory transformer VA rating and relay contact spec, so it powers the control circuit without overloading or nuisance tripping. Universal fan centers can be adapted but require rewiring and may not match the original transformer output. For a clean, plug-in-compatible repair, the OEM assembly is the safest choice.
Moderate (3/5). Plan for 20–30 minutes. Disconnect power, photograph the wiring, transfer leads one at a time to the new fan center, and verify 24V transformer output before restoring power.