Smith 100277940 Board is a critical low voltage connection board engineered for precision signaling in high-efficiency heating systems

It should not be used on steam-generating boilers or compressed air systems

usually resulting in a specific flash code during the HVAC system diagnostics

this SPST air pressure switch is the direct spec-match for systems requiring a precise negative pressure trigger

and E3Point Analog monitors

Lennox 43K69 Ignition Cable 319848-301 Smith 100277940 Board is aWhen you are dealing with a furnace that refuses to kick over, a compromised Lennox 43K69 Ignition Cable is often the silent culprit. This OEM Lennox ignition wire, also identified by model 65207600, is engineered specifically for high voltage spark transmission from the ignition control module to the spark electrode. As a veteran technician, you know that brittle or cracked insulation on a secondary lead results in voltage leaks and "ghost" ignition