🔥 100165923 Lochinvar Flame Sensor With Gasket – Replacement for PLT30003
The Lochinvar 100165923 Flame Sensor with Gasket is an OEM replacement part designed for FB series boilers in sizes 1500–3500. This sensor ensures safe and reliable flame detection for optimal boiler performance. Included with the sensor is the mounting gasket, allowing for a complete, hassle-free installation.
✅ Key Features
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✅ Direct Replacement for PLT30003, PLT20002, and 100165882
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✅ OEM-quality flame sensor with included gasket
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✅ Compatible with Lochinvar FB series boilers, sizes 1500–3500
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✅ Monitors burner flame and signals the control module for safe ignition
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✅ Durable construction for long-lasting performance in high-temperature environments
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✅ Easy installation with mounting hardware included
📊 Specifications
| Specification | Detail |
|---|
| Manufacturer |
Lochinvar |
| Part Number |
100165923 |
| Old Part Number |
PLT30003 |
| Included Components |
Flame sensor + gasket |
| Compatible Models |
FB1500–FB3500, FBL2500–FBL5000, FBN2500–FBN5000 |
| Replacement For |
PLT30003, PLT20002, 100165882 |
| Function |
Detects flame presence and signals ignition control |
| Application |
Residential and commercial FB series boilers |
🔁 Cross Reference / Compatible Replacements
| Replaces | Brand / Part |
|---|
| PLT30003 |
Original Lochinvar Flame Sensor |
| PLT20002 |
Legacy Replacement Part |
| 100165882 |
OEM Sensor for FB Series |
⚠️ Common Symptoms / When to Replace
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Boiler fails to ignite or maintain flame
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Frequent lockouts due to flame detection issues
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Intermittent flame sensing or weak flame signal
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Visible soot, corrosion, or damage on the sensor rod
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Inconsistent heating performance
Replacing the 100165923 flame sensor restores proper ignition monitoring and prevents unnecessary system downtime.
💬 Frequently Asked Questions (FAQ) ❓
Q: Which boilers does this flame sensor fit?
A: Fits Lochinvar FB series boilers, sizes 1500–3500, including FB, FBL, and FBN models listed above.
Q: Does this include the mounting gasket?
A: Yes, the package includes the required gasket for proper installation.
Q: What causes flame sensors to fail?
A: Accumulation of soot, oxidation, high heat stress, or mechanical damage.
Q: Can I clean the old sensor instead of replacing it?
A: Minor soot can be cleaned, but replacement is recommended if the sensor shows corrosion or damage.
Q: Will replacing this sensor fix lockouts?
A: Yes — replacing a faulty flame sensor resolves most flame-detection related lockouts.
🛒 Shopping Tips
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Verify your boiler model and size before purchase.
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Inspect the existing flame sensor for cracks, corrosion, or soot buildup.
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Ensure the included gasket is present for correct sealing.
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Handle the sensor carefully; the sensor rod is fragile.
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Keep a spare sensor on hand for larger installations or multiple boilers.
