Common Questions: What causes a Lochinvar air switch to fail

Rugged Construction: Built with a brass body and NBR (Nitrile) seals for long-term compatibility with non-corrosive fluids

If the control board signals a "stuck open" fault

If the furnace is throwing a diagnostic code for "open pressure switch

Johnson Controls M9220-601 Coupler Kit 322838-753 Common Questions: What causes aThe Johnson Controls M9220 601 Replacement Coupler Kit is a critical hardware component designed for the direct mount installation of M9220 xxx 3 series proportional electric spring return actuators. This kit is specifically engineered to adapt these high torque 177 lb in actuators to smaller damper shaft profiles that fall below the standard 3 4 inch minimum of the factory clamp. As a veteran requested solution for field retrofits, this actuator