Consult the diagnostic LED on the module

the 15B8 model excels in managing widely varying loads and modulating pressures

System Efficiency: Minimal 11

replacement is recommended every 6 to 12 months

Isolate the part from power and measure resistance

Weil McLain 383-500-205 Switch 321894-706 Consult the diagnostic LED onThe Weil McLain 383 500 205 Switch is a high reliability HVAC replacement rocker switch engineered specifically for service within Ultra Gas Boilers and Ultra Commercial Boilers. This SPST on off power switch is a critical component in maintaining the operational integrity of the primary control circuit. Rated for 16A @ 125V, it provides the robust electrical capacity required for heavy duty cycling in professional hydronic heating environments. As a