This is a dedicated liquid line filter drier

Operating on multiple line voltages (120/208/240 VAC)

or a flickering burner flame

or the control board flashing a "pressure switch stuck open" error code

While the 8-inch probe offers better sensing in many plenums

Resideo L7224U1002 Aquastat R-410A This is a dedicated liquidIf you're looking for a reliable, multi application controller for modern hydronic systems, the Resideo L7224U1002 Aquastat is the industry standard for a reason. This 120 Vac Electronic Oil Aquastat serves as a universal replacement for a wide range of older electromechanical and electronic models, including the 14662201 and the popular L8124A, L8124C, and L8148A series. As a technician, the first thing you'll appreciate is the LED diagnostic