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The Goodman B1141702 Fan Center Relay is a genuine OEM control assembly for Goodman GDI150-5 gas furnaces. The fan center combines a switching relay with an integral 24V control transformer, energizing the line-voltage blower motor on a thermostat call while isolating the low-voltage control side. It manages both heating and cooling blower operation, making it a central component of the furnace's control sequence. Symptoms of failure include a blower that won't start, runs continuously, or chatters.
This OEM Goodman fan center is pre-wired to the GDI150-5's connector layout and transformer VA rating. Generic fan centers can work electrically but often require re-terminating leads and verifying transformer capacity. The OEM assembly installs cleanly with matching terminals.
Best handled by an experienced DIYer or HVAC tech due to line- and low-voltage wiring. Cut power at the disconnect, photograph and label the existing wires, transfer them to the new relay terminal-for-terminal, and secure the assembly. Confirm blower operation on both heat and fan-on settings after install. Typical time: 45–60 minutes.