A common symptom is the boiler failing to ignite or going into lockout mode

provided the operating pressure remains within the sensor's designated range

As an essential HVAC sequencer replacement

Technicians typically observe pitted contacts

The 36C03-400 is rated for a maximum inlet pressure of 1/2 PSI (14

McDonnell & Miller WFE-120V Water Feeder 30067439-890 A common symptom is theThe McDonnell & Miller WFE 120V Water Feeder (Part Number 169560) is a heavy duty 120Vac electronic water feeder designed for professional grade steam boiler and hot water boiler management. Engineered as a universal Uni Match feeder, this unit integrates seamlessly with both probe type and float type low water cut offs (LWCO). It is a critical component for maintaining a safe water level, effectively preventing dry fire conditions by monitoring the