🔧 100166258 Lochinvar Pressure Switch – Replacement for PRS3428
The Lochinvar 100166258 Pressure Switch is an OEM-quality component designed to provide accurate pressure monitoring in Lochinvar boiler systems. With a setpoint of 1.35" Water Column (W.C.), this switch ensures safe and reliable operation by controlling airflow and pressure in various heating applications.
✅ Key Features
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✅ Direct Replacement for PRS3428, PRS2428, and 100166173
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✅ SPDT (Single Pole Double Throw) configuration for precise pressure control
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✅ Accurate setpoint: 1.35" Water Column (W.C.)
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✅ Compatible with a wide range of Lochinvar ER, ERL, ERN, BNR series boilers
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✅ Durable construction for long-lasting performance
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✅ Easy to install or replace in your existing system
📊 Specifications
| Specification | Detail |
|---|
| Manufacturer |
Lochinvar |
| Part Number |
100166258 |
| Old Part Number |
PRS3428 |
| Switch Type |
Pressure Switch, SPDT |
| Setpoint |
1.35" Water Column (W.C.) |
| Compatible Models |
ER401, ERL152-402, ERL152, ERN152, ERL252, ERN402, ER251, ERN252, BNR3416, ER151, ER301, ERL202, ERN302, ERL402, ERN202, ER201, ERN152-402, BNR3417, ERL302 |
| Replacement For |
PRS2428, PRS3428, 100166173 |
| Function |
Monitors system pressure and ensures safe operation |
🔁 Cross Reference / Compatible Replacements
| Replaces | Brand / Part |
|---|
| PRS3428 |
Original Lochinvar Pressure Switch |
| PRS2428 |
Legacy Replacement Part |
| 100166173 |
OEM Switch for Lochinvar Boilers |
⚠️ Common Symptoms / When to Replace
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Burner fails to start due to pressure lockout
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Intermittent operation or erratic burner cycling
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Visible damage or wear on the switch
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Inaccurate pressure readings causing safety lockouts
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Frequent system downtime or alarms
Replacing the 100166258 pressure switch ensures proper airflow and pressure monitoring, maintaining safe boiler operation.
💬 Frequently Asked Questions (FAQ) ❓
Q: Which boilers does this pressure switch fit?
A: Fits Lochinvar ER, ERL, ERN, BNR series boilers including ER401, ERL152-402, ERN402, BNR3416, and others listed above.
Q: What is the setpoint of this switch?
A: The switch operates at 1.35" Water Column (W.C.).
Q: Is this a direct replacement for PRS3428?
A: Yes — it replaces PRS3428, PRS2428, and 100166173.
Q: What issues indicate a failing pressure switch?
A: Erratic burner operation, lockouts, or inaccurate pressure readings.
Q: Can I install this myself?
A: Yes, but ensure power is off and follow proper safety procedures during installation.
🛒 Shopping Tips
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Confirm your boiler model and series before purchase.
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Inspect the existing switch for damage, corrosion, or wear.
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Handle the switch carefully; SPDT contacts are sensitive.
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Keep a spare switch for frequent maintenance or multiple boilers.
