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In your equipment, the board directs low-voltage controls and ignition steps. It coordinates with safety devices and components to keep the furnace running smoothly.
Specifications
- Part number: 24L8501
- Brand: Lennox
- Part type: Control board
- Ignition: SureLight Integrated Ignition
- Material: Plastic / Fiberboard
- System: Gas Furnace
- Voltage: 24 V
- Part number: listed as a replacement for yours
- Ignition type: same as your furnace
- Wiring: photo every wire first
From the maker's and parts sellers' listings for this number. Compare them with the label on your old part.
What the Lennox 24L8501 control board does
The control board operates as the central hub for your gas furnace. Most home thermostats and control boards communicate using a 24 V control signal from a transformer.
During a call for heat, the board monitors safety switches, manages the ignition sequence, and controls the blower. It ensures each stage happens in order before opening the gas valve.
What the specifications mean
Reviewing the listed ratings helps you understand how this board operates inside your furnace equipment.
- Voltage: 24 V. This is the low-voltage control signal powering the board circuits.
- System: Gas Furnace. Designed for use in residential gas heating systems.
- Ignition: SureLight Integrated Ignition. Matches systems built around this specific ignition setup.
- Material: Plastic / Fiberboard. The structural materials used to build the printed circuit board base.
How to confirm a match
Circuit boards must match the heating system's design. Installing an incorrect board can cause sequence errors or prevent the furnace from running.
- Part number: Make sure the replacement board is listed as a replacement for yours.
- Ignition type: Ensure the ignition type matches your furnace, such as SureLight Integrated Ignition.
- Wiring: The board must match the wiring layout of your furnace.
Safe replacement steps
Control boards have many wire connections that must go back to the exact same terminals. Take your time during removal and installation.
- Shut off electrical power to the furnace at the breaker and verify the power is off with a tester.
- Take clear photos of every wire connected to the board so you have an exact reference.
- Label each wire before loosening or disconnecting any terminals.
- Remove the old board from its mountings.
- Mount the replacement board securely in the furnace cabinet.
- Move wires one at a time to the matching spots on the replacement board.
Read your old part
- Locate the printed label or stamp on your current control board.
- Check that the label displays part number 24L8501.
- Verify that your furnace uses a 24 V control system.
- Confirm your heating equipment uses the SureLight Integrated Ignition system.
- Check that the board connects to a gas furnace.
When to call a pro
Board swaps on gas furnaces can need setup and testing. Hire a licensed HVAC technician for any step you are not sure you can do safely.
Questions
What voltage does the 24L8501 board run on?
The board operates on a 24 V control signal. Most home thermostats, contactor coils, and control boards use 24 V provided by a transformer.
Can I bypass a safety switch if the board shows a fault?
No, never bypass a flame sensor, pressure switch, limit switch, rollout switch, or float switch. These are safety devices designed to protect your home.
What ignition setup does this board use?
This part is specified for SureLight Integrated Ignition systems. The ignition type must match your furnace design.
What should I do before unplugging wires from the old board?
Always turn off power at the breaker and test for power first. Then take clear photos and label every wire before disconnecting anything.
Related part numbers
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- 300731Temperature Control Board, ClevelandSame part type
- 300678Temperature Control Board, ClevelandSame part type
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