Lochinvar & A.O. Smith 100110811 Switch 319825-402 While typically used for positive

While typically used for positive pressure in Carrier systems

For contractors performing maintenance or emergency repairs

Common signs include loud grinding or chattering noises (indicating bearing wear)

This factory-authorized kit is essential for performing solenoid valve repair

The S1-025-31813-000 ensures that if the system experiences restricted airflow—often due to a clogged filter or a failing secondary heat exchanger—the circuit breaks before the unit sustains damage

Lochinvar & A.O. Smith 100110811 Switch 319825-402 While typically used for positiveThe Lochinvar & A. O. Smith 100110811 Blocked Outlet Switch is a critical safety component designed for high efficiency commercial water heaters and boilers, including the Cyclone BTH and Armor series. This OEM pressure switch functions as a normally closed (NC) SPST contact, engineered to monitor flue gas backpressure. If the exhaust venting becomes obstructed or the pressure rises above the calibrated set point, the switch opens, breaking the 24V