Weil McLain 591-391-861 Wiring Harness AHE

The Weil McLain 591-391-861 Wiring Harness is an electrical connection component used to link control elements. It is installed in AHE heating units as part of the internal wiring network, where it carries power and signal connections between the control board, sensors and operating parts. In HVAC systems it supports coordinated operation of ignition, safety controls, and circulation by operating and maintaining electrical continuity. This component is typically replaced during service or repair when wiring affects system communication or stable boiler operation.