919943 Nordyne Control Board

Product Overview

919943 is a genuine OEM microprocessor-based control board for Nordyne HVAC systems. It sequences inducer startup, hot surface ignition, gas valve operation, blower functions, and safety interlocks, while providing multi-color LED diagnostics for fault codes.

Technical Specifications

• Control voltage: 24 VAC

• Board type: Microprocessor logic controller

• Diagnostic indicators: Multi-color LED status/fault codes

• Terminals: Push-on and screw connectors for thermostat, limit switches, inducer, gas valve, blower, and flame sensor

• Operating temperature: –40 °F to 140 °F

• Weight: 0.67 lb

• Mounting: Direct-fit to OEM bracket pattern 

Cross-Reference Part Numbers

No documented superseded or alternate part numbers; 919943 serves as the direct OEM replacement.

Compatibility

Fits Nordyne gas furnaces and packaged HVAC units originally equipped with control board part number 919943. Always verify against the appliance’s data-plate part number or service manual before ordering.

Technician Notes

1. De-energize all line-voltage and 24 VAC control power; lock out/tag out per safety procedures.

2. Photograph or label each wire harness and connector location before removal.

3. Unmount the old board and inspect wiring harnesses for wear or corrosion.

4. Install the new 919943 board onto the OEM bracket; ensure all mounting holes align.

5. Reconnect every wire per your reference photos or the service manual; ensure tight, corrosion-free connections.

6. Restore control power; a steady green LED indicates normal operation.

7. Call for heat (or cooling) to verify proper inducer start, ignition sequence, blower ramp, and flame proving.

8. If a fault occurs, note the LED flash code pattern and consult the OEM service manual for troubleshooting.