Weil McLain 383-500-602 Temp Sensor and pitch to the manufacturer's

and pitch to the manufacturer's original specs

the switch is likely stuck open and requires replacement

The lever arm features specific mounting points that determine the feedback ratio

preventing leaks while ensuring high thermal conductivity for precise response times

Weil McLain 383-500-602 Temp Sensor and pitch to the manufacturer'sThe Weil McLain 383 500 602 is a critical return supply temperature sensor kit engineered for precise thermal monitoring within Weil McLain Ultra and SlimFit series boilers. This 12 Kohm NTC thermistor assembly provides real time data to the control board, allowing for accurate modulation and preventing short cycling. As a dedicated boiler replacement part, it ensures the system maintains the delta T required for high efficiency condensing operation.