Weil McLain 591-391-862 Wiring Harness Els PW 17895 As a two-position (on/off) component

As a two-position (on/off) component

which can lead to the filter collapsing under load or allowing debris to accumulate on the secondary heat exchanger

As a seasoned tech

The internals are outfitted with plated brass balls and virgin PTFE seats to withstand continuous service temperatures up to 250°F and a maximum working pressure of 50 psi

making it compatible with high-pressure R-410A systems as well as standard R-22 and R-134a applications

Weil McLain 591-391-862 Wiring Harness Els PW 17895 As a two-position (on/off) componentThe Weil McLain 591 391 862 Wiring Harness is a critical OEM replacement part designed for standing pilot ignition systems in Weil McLain CG and CGa boilers. Engineered for hydronic heating service, this harness provides secondary electrical integrity between the gas valve, pilot, and control module, maintaining consistent boiler performance. In the field, a compromised harness is often the root cause of intermittent pilot ignition failure or erratic