624754R Nordyne Control Board
624754R Nordyne Control Board
Description
The 624754R is the OEM microprocessor control board for Nordyne/Coleman gas furnaces and packaged heat pump systems. It orchestrates ignition sequencing, inducer control, gas valve operation, blower staging, safety interlocks, and fault diagnostics. An onboard LED communicates multi-flash fault codes for rapid troubleshooting.
Key Specifications
| Specification | Details |
|---|---|
| Part Number | 624754R |
| Dimensions (L×W×H) | 5.5 in × 3.15 in × 3.05 in |
| Weight | 0.52 lb (235 g) |
| Control Voltage | 24 VAC |
| Connectors | X1 (line/transformer), X2 (safeties), X3 (gas/ignitor/flame sense) |
| Diagnostic LED | Multi-flash fault-code indicator |
| PCB Protection | Conformal coating, corrosion-resistant terminals |
Compatibility
This board supersedes original part 624754 and fits a broad range of Nordyne/Coleman equipment:
| Original Part No. | Replacement | Typical Applications |
|---|---|---|
| 624754 | 624754R | M4, M6, M7 gas furnaces (downflow/upflow) |
| 624754 | 624754R | DD, Q5RE, PCM packaged heat pumps |
Always verify your furnace or heat pump’s data plate and control harness configuration before ordering.
Installation Tips
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Power Down First Disconnect all electrical supply before servicing to prevent damage or injury.
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Document & Label Wiring Photograph harness connections at X1, X2, and X3 before removal; relabel wires to ensure accurate reassembly.
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Mount Securely Use OEM standoffs; avoid over-torquing screws to prevent PCB stress or warping.
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Verify 24 VAC Measure voltage at the board’s X1 terminals; confirm ~24 VAC before connecting safety and gas circuits.
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Commissioning After restoration of power, observe LED flash patterns. Refer to the fault-code chart to clear any pre-existing errors.
Cross-Reference & Resources
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OEM Replacement Mapping: 624754 → 624754R
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LED Fault-Code Lookup Chart for Nordyne Control Boards
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Wiring-Diagram Overlay with Connector Pin-outs (X1, X2, X3)
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Troubleshooting Flowchart: “No Ignition” → “Lockout Reset Procedure”