ST9120C Furnace Fan Control Board fits for Honeywell Furnace Fan

Key features

• DIRECT REPLACEMENT FOR ST9120A, ST9120B, ST9120C AND R40403 SERIES CONTROLS: This SPORDA board replaces Honeywell part numbers R40403-001, R40403-002, R40403-003, and 20054502, and is fully compatible with ST9120A, ST9120B, and ST9120C furnace fan controls.Check your existing board's part number against this list before ordering. No wiring modifications are required for a direct swap.
• FULL ELECTRICAL SPECIFICATIONS FOR DIRECT INSTALLATION VERIFICATION: Operating line voltage: 85–135VAC, 50/60Hz. Secondary control voltage: 18–30VAC. Maximum blower load: 15FLA / 30LRA at 120VAC. Maximum inducer load: 3FLA / 10LRA at 120VAC. Confirm your furnace blower motor's full-load amperage (FLA) does not exceed 15A and inducer motor FLA does not exceed 3A before installing. These ratings cover the majority of standard residential gas furnace configurations.
• 5A REPLACEABLE FUSE AND ADJUSTABLE BLOWER DELAY VIA DIP SWITCH: The board includes a 5A automotive-style fuse on the 24V circuit. If a voltage spike trips the fuse, replacement uses any standard 5A automotive fuse available at hardware stores. The dip switch on the board allows blower delay timing to be adjusted without rewiring. Both features are accessible after installation without removing the board from the furnace cabinet.
• Connects to your existing wiring harness using the original connectors for most direct swaps. Furnaces originally using part number 20054502 on dedicated horizontal units with spark ignition require a brief ignition cable rerouting step per the included instructions to prevent nuisance lockouts.This board connects to your existing wiring harness using the original connectors. Before disconnecting the old board, photograph your current wiring layout to use as a reference during reinstallation.Standard installation requires a screwdriver and access to the furnace control cabinet.
• COVERS FOUR PART NUMBER FAMILIES WITH ONE SKU: This board replaces R40403-001, R40403-002, R40403-003, 20054502, ST9120A, ST9120B, and ST9120C in a single order. For homeowners and HVAC technicians who service multiple furnace brands, keeping one board on hand covers the most common Honeywell-compatible blower control configurations.
• Provides two independent 0.8A @ 115VAC terminals — one dedicated to the humidifier and one dedicated to the electronic air cleaner.Dedicated 0.8A @ 115VAC terminal for electronic air cleaner, separate from the humidifier terminal.

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