If the blower runs but the burner never ignites

The Johnson Controls S-2300-1 is a commercial-grade pneumatic selector switch designed for versatile control in HVAC systems and industrial logic circuits

or error codes related to the air pressure switch failing to close during the startup sequence

ensuring consistent suction and discharge pressures in demanding commercial environments

Lennox 21L88 Electrode Lead 320735-701 If the blower runs butAs a veteran tech, you know that a steady ignition sequence is the backbone of any reliable furnace or rooftop unit. The Lennox 21L88 Electrode Lead is a genuine OEM component engineered to maintain a secure electrical path between the ignition control and the spark electrode. This high voltage ignition wire is built to withstand the intense thermal environment inside the burner compartment, preventing insulation breakdown that often leads to nuisance