Emerson 50X57-843 White Rodgers Single Stage IFC
Emerson 50X57-
Replacement Control Board — Compatible Models
This replacement circuit board fits these Lennox rooftop and package units: Coleman Echelon, Coleman Powermore, Lennox CBX, Lennox CBX* series, and specific models with control board part numbers 100422‑01, 100422‑02, 100422‑03, 100422‑04, and 101184‑01. It is also compatible with York and Ducane package units that use the equivalent board (common OEM cross-reference: K101184). Confirm your unit’s existing board part number before ordering.
Features:
Direct OEM replacement for listed part numbers
Pre-programmed for HVAC control functions
Same mounting and connector layout as original
If you’re unsure which part number is in your unit, send the label photo and model number and we’ll verify compatibility.
843 (White‑Rodgers) Single-Stage Integrated Furnace Control (IFC)
Key Features
Single‑stage operation: Supports on/off furnace systems (one heat call stage).
Integrated safety functions: Monitors flame sensing, limit switches, rollout switches, and provides lockout on fault conditions.
Diagnostic LED: Built‑in status LED for fault codes and startup sequencing—simplifies troubleshooting.
Ignition control: Manages hot surface ignitor or intermittent pilot ignition sequences (model-specific; verify compatibility).
Blower control outputs: Provides blower relay/ fan sequencing for furnace blower operation during heating and post-purge.
Mounting: Standard screw-mount PCB form factor for easy swap into compatible furnace models.
Connector layout: Pluggable terminals designed for OEM harnesses—match terminal labels to existing furnace wiring.
Common Applications
Replacement for original equipment control in single-stage gas furnaces from various OEMs.
Compatibility and Replacement Notes
Confirm model number and part number compatibility with the existing control before purchasing. Check the PCB label for Emerson/White‑Rodgers part numbers and date codes.
Verify system type (hot surface ignition vs. intermittent pilot), transformer voltage, and terminal functions to ensure the 50X57-843 matches the furnace requirements.
If replacing due to a fault code, note any associated field devices (limit switches, flame sensor, gas valve, blower motor) that may need inspection or replacement as well.
Installation Tips
Turn off all power to the furnace at the breaker and disconnect the gas supply before servicing.
Photograph or label all wiring before removal to ensure accurate reconnection.
Observe electrostatic discharge (ESD) precautions—ground yourself or use a wrist strap when handling the PCB.
Replace any corroded or damaged wire harness connectors; poor connections are a common failure cause.
After installation, restore power and run through a full heat call sequence while monitoring LED diagnostics and verifying safe operation (proper ignition, flame sense, blower sequencing, and no fault lockouts).
Overview The Emerson 50X57-843 is a direct-replacement single‑stage Integrated Furnace Control (IFC) board manufactured under the White‑Rodgers line. It handles ignition, gas valve sequencing, blower control, safety monitoring, and diagnostic functions for residential gas furnaces with single-stage operation. Designed for reliable service and straightforward installation, this control is commonly used in many basic furnace systems.
Emerson 50X57-
Replacement Control Board — Compatible Models
This replacement circuit board fits these Lennox rooftop and package units: Coleman Echelon, Coleman Powermore, Lennox CBX, Lennox CBX* series, and specific models with control board part numbers 100422‑01, 100422‑02, 100422‑03, 100422‑04, and 101184‑01. It is also compatible with York and Ducane package units that use the equivalent board (common OEM cross-reference: K101184). Confirm your unit’s existing board part number before ordering.
Features:
Direct OEM replacement for listed part numbers
Pre-programmed for HVAC control functions
Same mounting and connector layout as original
If you’re unsure which part number is in your unit, send the label photo and model number and we’ll verify compatibility.
843 (White‑Rodgers) Single-Stage Integrated Furnace Control (IFC)
Key Features
Single‑stage operation: Supports on/off furnace systems (one heat call stage).
Integrated safety functions: Monitors flame sensing, limit switches, rollout switches, and provides lockout on fault conditions.
Diagnostic LED: Built‑in status LED for fault codes and startup sequencing—simplifies troubleshooting.
Ignition control: Manages hot surface ignitor or intermittent pilot ignition sequences (model-specific; verify compatibility).
Blower control outputs: Provides blower relay/ fan sequencing for furnace blower operation during heating and post-purge.
Mounting: Standard screw-mount PCB form factor for easy swap into compatible furnace models.
Connector layout: Pluggable terminals designed for OEM harnesses—match terminal labels to existing furnace wiring.
Common Applications
Replacement for original equipment control in single-stage gas furnaces from various OEMs.
Compatibility and Replacement Notes
Confirm model number and part number compatibility with the existing control before purchasing. Check the PCB label for Emerson/White‑Rodgers part numbers and date codes.
Verify system type (hot surface ignition vs. intermittent pilot), transformer voltage, and terminal functions to ensure the 50X57-843 matches the furnace requirements.
If replacing due to a fault code, note any associated field devices (limit switches, flame sensor, gas valve, blower motor) that may need inspection or replacement as well.
Installation Tips
Turn off all power to the furnace at the breaker and disconnect the gas supply before servicing.
Photograph or label all wiring before removal to ensure accurate reconnection.
Observe electrostatic discharge (ESD) precautions—ground yourself or use a wrist strap when handling the PCB.
Replace any corroded or damaged wire harness connectors; poor connections are a common failure cause.
After installation, restore power and run through a full heat call sequence while monitoring LED diagnostics and verifying safe operation (proper ignition, flame sense, blower sequencing, and no fault lockouts).
Overview The Emerson 50X57-843 is a direct-replacement single‑stage Integrated Furnace Control (IFC) board manufactured under the White‑Rodgers line. It handles ignition, gas valve sequencing, blower control, safety monitoring, and diagnostic functions for residential gas furnaces with single-stage operation. Designed for reliable service and straightforward installation, this control is commonly used in many basic furnace systems.