Lennox 19M54 Board Kit

The 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 such as intermittent lockouts or failed flame rectification. The kit includes the 23L53 integrated furnace control, various wiring harness adapters (9-pin to 6-pin and 15-pin to 6-pin), and necessary hardware to ensure a seamless OEM board replacement.

Engineered for 24VAC systems, the Lennox 19M54 features a diagnostic LED to streamline troubleshooting on the job site. By integrating the blower control and ignition sequence into a single robust module, this kit improves overall system reliability. Contractors should verify the specific unit model as this kit serves as a direct crossover part for multiple legacy Lennox and Allied Air part numbers, including 43K49 and 65310400. Proper installation involves utilizing the enclosed mounting plate and ground wire assemblies to maintain electrical integrity across the control board circuitry.

• Universal Conversion: Upgrades obsolete GCI-3 and RAM-3MC5 controls to the modern GCI-3A (23L53) standard.
• Enhanced Diagnostics: Integrated green LED provides flash codes for rapid identification of pressure switch failures or flame sense issues.
• Complete Installation Package: Includes 9-pin and 15-pin adapters, burner box tops, and ground wires to eliminate the need for extra shop parts.
• OEM Reliability: Genuine Lennox replacement part ensures technical compatibility with LF24-100A, LD24-125, and other 24 series models.

Which older boards does the 19M54 kit replace?
This kit is the official replacement for Lennox parts 43K49, 17K44, 33J62, 65310400, and R76716900. It converts these legacy systems to the 23L53 control platform.

What are the diagnostic codes for this board?
The onboard LED indicates status: a slow flash means normal operation, while 2 flashes typically signal a failed pressure switch and 3 flashes indicate an open primary limit or rollout switch.

Is this kit compatible with residential furnaces or just unit heaters?
While primarily used in LF24 and LD24 unit heaters/duct furnaces, it is also utilized in specific compact models. Always verify the wiring harness against the 9-pin or 15-pin plugs in your unit.

This item is not eligible for free shipping.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.