1046638S Nordyne Silicon Nitride Replacement Ignitor (G7)
1046638S Nordyne Silicon Nitride Replacement Ignitor (G7)
Product Overview
1046638S is an official OEM silicon nitride ignitor engineered for Nordyne G7, G7S, MGC, and GUH series furnaces. It delivers rapid, reliable ignition with exceptional thermal shock resistance and a long service life.
Cross-Reference Part Numbers
| OEM Part Number | Replaces |
|---|---|
| 1046638S | 1017743S |
| 921074 | |
| 632504 | |
| 904839 |
Cross-reference info sourced from SupplyHouse and GSIstore.
Compatibility
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Fits Nordyne and Intertherm G7, G7S, MGC, and GUH series furnace models
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Operates on standard line voltage (120 VAC)
Compatibility details courtesy of GSIstore.
Technician Notes
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Handle only by ceramic ends; avoid touching the silicon nitride surface to prevent oil contamination.
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Verify ignitor alignment and gap per OEM specifications—misalignment can cause delayed ignition or no spark.
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Inspect burner assembly and flame sensor for corrosion or debris before installing the new ignitor.
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Check wiring harness and connector pins; replace corroded or pitted connectors to ensure reliable voltage delivery.
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After installation, cycle through at least three start-up attempts, observing consistent glow and flame establishment.
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Allow a 60 second cooling interval between failed ignition attempts to prevent thermal stress damage.
Additional Resources
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Download the OEM installation instructions and wiring diagram PDF
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Access a printable ignitor cross-reference sheet for all Nordyne/Intertherm models
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Watch our video guide: step-by-step ignitor replacement for G7 furnaces