Furnace status LED - tri-color (green, red and amber)
Pushbutton fault history retrieval
Heat fan off delay (dipswitch selectable), fan on delay for cooling, and auto second-stage delay
Includes 21D64-2 Silicon Nitride ignitor kit and module
The White-Rodgers 21M51U-843 universal integrated furnace control kit is a two-stage hot surface ignition control kit for three-speed systems (PSC Blower Motor). The kit includes 21D64-2 Silicon Nitride ignitor kit and module. Replaces White-Rodgers 50M51-242 and all 50M61-xxx's two-stage HSI systems with 80V or 120V Ignitors. Brand: Emerson Thermostats, Model: 21M51U-843, Color: 9.75
Custom Tab 01
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