- 【Compatible】: R40403-003 control board for ST9120A, ST9120B, ST9120C and Concord furnaces.
- 【Application】: Ideal for replacing old or malfunctioning control boards in various heating systems.
- 【Features】: This board manages a dual-speed indoor blower motor and a single-speed inducer motor. It accepts inputs from thermostats, pressure switches, and high-temperature limit switches.
- 【Installation】: Easy to install with no extra wiring kit required; includes user manual for guidance. Designed to work seamlessly with original and updated wiring setups.
- 【Notes】: Ensure proper connection by documenting the existing wire layout before replacement. Always verify terminal connections as per the instructions.
On Apr 25, 2026 at 21:14:19 PDT, seller added the following information: