Description
No need to guess with the White-Rodgers 21M51U-843, it’s built to step in for a wide range of control boards, from 50A51s to 50M61s, making it a dependable fix across multiple brands.
Key Features & Benefits
Cuts Down on Inventory
Replaces most White-Rodgers 50A51, 50M51, and 50M61 two-stage hot surface ignition controls, so one kit covers a broad range of OEM boards instead of carrying many individual parts.
Works Across Major Furnace Brands
Services popular Amana, Armstrong, Lennox, Trane, Goodman, and York family furnaces, making it a go-to universal board for mixed-brand service.
Universal Nitride Ignitor
Ships with the 21D64-2 120V nitride ignitor kit, so you can replace controls on furnaces that originally used either 80V or 120V hot surface ignitors.
Full Control of A Two-Stage System
Controls the gas burner, two-stage gas valve, inducer motor, and 3-speed PSC blower, plus provides dedicated outputs for a 120V humidifier and electronic air cleaner, with everything on one integrated board.
LED Status Codes
Diagnostic LEDs and stored fault codes give you a clear view of where the sequence failed: ignition, airflow, or limits.
Safety and Equipment Protection
Uses factory safety timings, fast gas shutoff on flame failure, and fuse protection on the control to help protect both the furnace and the homeowner.
Simple Installation
Includes the ignition control module, universal ignitor kit, motor lead extensions, Trane ignitor bracket, and installation instructions with OEM cross-reference to make changeouts faster and less error prone.
