Lochinvar & A.O. Smith 100208306 Indicator Light check for continuity across the

check for continuity across the terminals when the switch is cool

it features a 3-inch insertion depth and is factory-calibrated to trip at 180°F (opening the circuit to kill the gas valve) and automatically reset at 150°F (closing the circuit)

Durable Construction: Manufactured to resist mechanical fatigue during high-cycle furnace and blower operations

Direct Fit: As a genuine OEM part

Cross-referencing your furnace model or checking for part HQ1004303TD will confirm compatibility

Lochinvar & A.O. Smith 100208306 Indicator Light check for continuity across theThe Lochinvar & A. O. Smith 100208306 Indicator Light is a critical diagnostic component for maintaining the operational integrity of high efficiency boilers and water heaters. Operating at 28V (and compatible with 24V control circuits), this white indicator light serves as a primary visual interface for monitoring system status and identifying lockout conditions or power faults. This part is a direct factory replacement for MSC2449 and is engineered