a compromised housing is a primary suspect after you have ruled out the motor and tubing

As a direct replacement for 78-404-RV

Its solid-state architecture provides the reliable signal processing required for secondary components like pressure switches and limit controls to function within the safety loop

It monitors temperatures via the remote bulb and breaks the control circuit if the setpoint is exceeded

the 2-10VDC input can be converted to accept a 4-20mA command signal

Ecobee EB-STATE6P-01 Thermostat 322838-753 a compromised housing is aThe ecobee EB STATE6P 01 Smart Thermostat Premium is the professional grade solution for advanced HVAC control, serving as the direct functional replacement for the EB STATE5P 01. Engineered for maximum system compatibility, this unit supports 24 VAC conventional systems (2H 2C) and heat pump configurations (4H 2C) including multi stage auxiliary heat and multi speed fans. Unlike previous iterations, the EB STATE6P 01 features a zinc alloy housing and