Find any Amazon.com product's deals and best prices with our free Amazon deal finder and price tracker. Simply paste the product link (URL) or search by name in the box above. You'll get full product information, Deal Score, and all current deals. Shop smarter with the best Amazon deals finder in the USA.
x
Sorry, Something went wrong!
ST9120C Furnace Fan Control Board fits for Honeywell Furnace Fan
✅ In stock
F
Grade
⚠️ Price may have changed. Last updated 24+ hours ago — confirm on Amazon.
Check Deal at Amazon
Price verified Nov 5, 2026 11:57 PM · Prices & availability subject to change
Is This a Good Price on Amazon?
💤 Not a Deal- 💤Verdict: Not a Deal. Price is at or above historical norms. Best to wait for a sale.
- ➡️Pricing has held fairly steady, with no strong push in either direction.
How We Scored This Deal
Price Competitiveness
0/28
Recent Value
0/22
Market Standing
0/20
Deal Strength
0/20
Momentum
0/10
📝 Product Overview
🏪 Sold by
SPORDA
📦 Fulfillment
Fulfilled by Amazon
🚚 Shipping
Free Shipping
Product Details
✓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.
⚙️ Specifications
High-load blower support
Rated for up to 15 FLA / 30 LRA at 120 VAC and 7.5 FLA / 15 LRA at 240 VAC
Inducer motor compatibility
Handles 3 FLA / 10 LRA at 120 VAC and 1.5 FLA / 5 LRA at 240 VAC
Accessory terminals
Provides two independent 0.8A @ 115VAC terminals — one dedicated to the humidifier and one dedicated to the electronic air cleaner
Low-voltage operation
Runs on 18–30 VAC for thermostat and ignition interface
Versatile HVAC integration
Suitable for a wide range of forced-air furnace applications
Precision load handling
Multiple FLA/LRA ratings ensure correct pairing with blower and inducer motors
Electronic air cleaner support
Dedicated 0.8A @ 115VAC terminal for electronic air cleaner, separate from the humidifier terminal
Reliable construction
Honeywell design ensures stable long-term HVAC system performance
Manufacturer
SPORDA
Part Number
ST9120C
Item Weight
7 ounces
