Description
The 50M56X-843 is a universal control that lets you replace failed single-stage furnace boards on PSC or ECMx systems without guessing at OEM parts or stocking a dozen different SKUs. Techs can walk into almost any compatible HSI job, swap the board, and get the system back online quickly.
Key Features & Benefits
Universal Coverage for Single-Stage HSI
Configurable for both PSC and ECMx blower motors and built to replace well over 550 single-stage HSI controls across major brands.
Universal 120V Nitride Ignitor
Ships with a 120V HotRod nitride ignitor so you can replace ignitors and upgrade many older 80V ignition systems.
App-Guided Setup and Diagnostics
Uses NFC and the White-Rodgers Connect app for quick, menu-driven configuration and fault viewing even without power.
No Extra Harnesses Needed
OEM harness detection and multiple built-in connector styles let you plug factory wiring directly into the board.
Microprocessor-Based Precision and Protection
A microprocessor manages ignition timing, blower delays, and safety checks, while a replaceable low-voltage fuse, standard safety timings, and fast gas shutoff help protect the furnace.
Support for Comfort Accessories
Provides 120V outputs for an electronic air cleaner and humidifier (up to 1 A), plus dehumidification and second-stage cooling options, so IAQ and comfort add-ons stay under one integrated control.
On-Board Display and Diagnostics
A 7-segment display, status LEDs, and printed fault code table give you clear feedback on system status, configuration, and error conditions.
