🔥 100073343 LOCHINVAR Flame Sensor With Gasket – For Crest FBN(L) 751–2001 Boilers
The Lochinvar 100073343 Flame Sensor With Gasket is a genuine replacement component designed to ensure reliable flame detection and safe ignition performance in Crest model FBN(L) 751–2001 heating boilers.
This flame sensor monitors burner ignition and sends a signal to the control module confirming flame presence. A failed or dirty sensor can result in ignition lockouts or system shutdowns.
Includes factory gasket for proper sealing and easy installation.
✅ Key Features
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✅ OEM Lochinvar Part — Ensures perfect fit and reliable performance
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✅ Includes Gasket — Provides a complete, ready-to-install repair solution
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✅ Designed for Crest FBN(L) 751–2001 Models
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✅ Ensures Safe Flame Detection — Monitors flame presence for safe burner operation
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✅ Durable Construction — Built for consistent performance in high-heat environments
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✅ Easy Replacement — Simple installation for fast service turnaround
📊 Specifications
| Specification | Detail |
|---|
| Manufacturer |
Lochinvar |
| Part Number |
100073343 |
| Description |
Flame Sensor With Gasket |
| Compatible Models |
Crest FBN(L) 751–2001 Heating Boilers |
| Function |
Detects flame presence and signals ignition control |
| Material |
High-temperature stainless steel sensor with insulated lead |
| Included Components |
Flame sensor + mounting gasket |
| OEM Replacement For |
PLT20013, 100189236, PLT30009 |
🔁 Cross Reference / Replaces
| Part Number | Brand / Description |
|---|
| PLT20013 |
Lochinvar Replacement Flame Sensor |
| 100189236 |
Lochinvar OEM Sensor Assembly |
| PLT30009 |
Legacy Replacement Version |
⚠️ Common Symptoms / When to Replace
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Boiler fails to ignite or maintain flame
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Flame detected message not registering on control board
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System goes into lockout or short-cycling
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Sensor tip corroded, cracked, or sooty
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Intermittent ignition or weak flame signal
Replacing the 100073343 flame sensor restores proper ignition monitoring and prevents nuisance lockouts.
💬 Frequently Asked Questions (FAQ) ❓
Q: Does this include the gasket?
A: Yes, this part ships with the required gasket for proper installation.
Q: Is it compatible with older Crest models?
A: It fits all Crest FBN(L) 751–2001 series units.
Q: What causes flame sensors to fail?
A: Buildup of soot or oxidation on the sensor rod, vibration wear, or prolonged exposure to high temperatures.
Q: Can I clean my old flame sensor?
A: Minor soot can be cleaned with fine steel wool, but replacement is recommended if corrosion or damage is present.
