Bypassing a 180-degree limit switch is never recommended outside of momentary diagnostic testing by a qualified technician

Enhanced System Reliability: Robust microprocessors handle complex ignition and modulation logic to maximize unit efficiency

maintaining the structural integrity of the heat exchanger

Technicians should also verify that the gas manifold pressure is not over-fired

this model is battery-powered and does not require a common wire to operate the digital display or system switching

Lennox 90W54 Lead R-134A Bypassing a 180-degree limit switchThe Lennox 90W54 Ignition Lead is a critical 25 inch high voltage conductor specifically engineered for demanding HVAC burner ignition cycles. This OEM component ensures consistent spark delivery between the ignition module and the pilot or igniter assembly, maintaining the thermal integrity required for Lennox gas furnace operations. Fabricated with heat resistant insulation, the 90W54 lead wire is designed to perform within high temperature furnace