This dual-setpoint pressure switch features an automatic reset function

Why did my original limit switch trip

while 2 flashes typically signal a failed pressure switch and 3 flashes indicate an open primary limit or rollout switch

making it ideal for the demanding thermal conditions of industrial gas burners

Wiring should follow the Line M1 close-high logic for the auxiliary circuit

Lennox 19M54 Board Kit Els PW 29614 This dual-setpoint pressure switch featuresThe Lennox 19M54 Board Kit is a critical gas furnace ignition control replacement designed to upgrade older GCI 3, RAM 3MC5, and EGC 2 platforms to the more reliable GCI 3A (23L53) ignition control board. This comprehensive Lennox 19M54 conversion kit is essential for technicians servicing LF24 and LD24 Series unit heaters and duct furnaces. It ensures precise intermittent pilot ignition sequencing and system diagnostics, resolving common field issues