Repeated tripping usually points to a water flow issue

This OEM replacement hi-limit switch is engineered with a 7-inch insert probe to provide accurate thermal sensing deep within the cabinet or ductwork

as the control logic is based on valve positioning and pressure/temperature sensor inputs processed through the main system controller

allowing you to combine values using the included jumper wires

This specific model features a manual reset and power outage feature

Aprilaire 6404 Control 319852-301 Repeated tripping usually points toThe Aprilaire 6404 Control is a professional grade 4 zone control panel designed to provide precise HVAC zoning solutions for both residential and commercial applications. This universal multistage zone controller is compatible with single stage heat cool, multi stage conventional (up to 2H 2C), and heat pump systems (up to 4H 2C). Featuring an LCD display for setup and LED status indicators for real time diagnostics, the Aprilaire 6404 simplifies the