🔥 100279407 Lochinvar Rear Flame Sensor w/ Gasket – Replacement for PLT20016
The Lochinvar 100279407 Rear Flame Sensor with Gasket is an OEM-quality replacement designed for FB series boilers (751–2001 models). This sensor ensures accurate flame detection at the rear burner location, helping maintain safe and efficient operation of your boiler. The kit includes both the sensor and gasket for proper installation.
✅ Key Features
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✅ Direct Replacement for PLT20016 and 100209733
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✅ OEM-quality rear flame sensor with gasket
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✅ Ensures reliable flame detection for FB series boilers
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✅ Compatible with FB 751–2001 model range
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✅ Durable construction for high-temperature performance
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✅ Easy installation with included gasket
📊 Specifications
| Specification | Detail |
|---|
| Manufacturer |
Lochinvar |
| Part Number |
100279407 |
| Old Part Number |
PLT20016 |
| Included Components |
Rear flame sensor + gasket |
| Compatible Models |
FB series boilers, 751–2001 |
| Replacement For |
PLT20016, 100209733 |
| Function |
Detects rear flame and signals control module for safe ignition |
🔁 Cross Reference / Compatible Replacements
| Replaces | Brand / Part |
|---|
| PLT20016 |
Original Lochinvar Rear Flame Sensor |
| 100209733 |
OEM Replacement for FB Series Boilers |
⚠️ Common Symptoms / When to Replace
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Burner fails to ignite at rear burner
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Intermittent or erratic flame sensing
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Lockouts caused by rear flame detection failure
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Visible corrosion, soot buildup, or damage on the sensor
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Poor heating performance from the rear section of the boiler
Replacing the 100279407 rear flame sensor restores proper ignition and ensures safe boiler operation.
💬 Frequently Asked Questions (FAQ) ❓
Q: Which boilers is this rear flame sensor compatible with?
A: Fits Lochinvar FB series boilers, models 751–2001.
Q: Does this include the mounting gasket?
A: Yes — the kit includes both sensor and gasket for proper sealing.
Q: Can this sensor fix burner lockouts?
A: Yes — replacing a faulty rear flame sensor resolves most flame-detection lockouts.
Q: Is this a direct replacement for PLT20016?
A: Yes — it replaces PLT20016 and 100209733.
🛒 Shopping Tips
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Verify your boiler model and series before purchasing.
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Inspect the rear flame sensor area for soot, corrosion, or damage.
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Use the included gasket to ensure proper sealing.
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Handle the sensor carefully — the sensor rod is fragile.
