R40403-003 – CONTROL BOARD (ST9120)
R40403-003 integrated furnace control board (ST9120 series). Replaces older ST9120A/B/C/G models. Controls blower, inducer, and ignition timing.
Walk in. We test every part free at the counter. Open to homeowners, contractors, and multifamily — no account or minimum order.
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Bring your old part. We'll diagnose it, find the replacement, and bench-test the new one at the counter before you leave — so you only make one trip.

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R40403-003 integrated furnace control board (ST9120 series). Replaces older ST9120A/B/C/G models. Controls blower, inducer, and ignition timing.

Supco BRK3 resettable 3 Amp diagnostic fuse for HVAC low-voltage circuits. Built-in light shows when circuit is active. Resets instead of blowing — saves time troubleshooting.

Nordyne 903915A control board. OEM replacement for Nordyne gas furnaces. Also sold under part number 624643. Manages ignition, blower, and safety functions.

50+5 MFD 440V dual run capacitor. Powers both the compressor and condenser fan motor. Fits most residential AC systems. American-made by Titan HD.

Goodman B1376857 motor mount arms, set of 3. OEM replacement for Goodman and Amana furnaces and air handlers. Secures the blower motor in the housing.

12.5 MFD 440V oval run capacitor. Powers a single motor — usually the condenser fan. Budget-friendly TrueLine replacement for any 12.5 MFD oval cap.

12.5 MFD 440V oval run capacitor. Powers a single motor — usually the condenser fan. American-made by Titan HD. Compact oval shape fits tight spaces.

Universal door interlock switch (SWT01714). Fits Trane, Carrier, York, and more. SPST, 125/250VAC, 21A rated. Shuts off the furnace when the access panel is removed.

18″x18″ flame-resistant magnetic blanket for brazing in tight spaces. Integrated magnets stick to metal surfaces, reinforced grommets, and center slit for pipes. Protects walls and wiring.

Supco SIG102 universal spiral hot surface ignitor. Silicon carbide, fast heat-up. Fits a wide range of furnaces with the included mounting hardware.