On models equipped with the test feature

making it a standard inventory item for technicians servicing residential heating systems

the TER35-HW100 provides exceptional durability against corrosion and pressure spikes

Proper installation ensures optimal flame sensing and ignition timing

What causes a B1370159 pressure switch to fail

Johnson Controls W42AA-1 Humidistat 323269-701 On models equipped with theThe Johnson Controls W42AA 1 Humidistat is a heavy duty, 3 wire humidity controller designed for precision management of both humidifying and dehumidifying equipment. Engineered with a stable 150 strand human hair sensing element, this unit provides superior sensitivity and long term accuracy compared to synthetic alternatives. It operates on line voltage (120 240 VAC) or low voltage circuits, utilizing a Single Pole Double Throw (SPDT) snap acting