Lennox X8609 Fan Timer Board

The Lennox X8609 Fan Timer Board serves as a critical electronic interface for managing blower motor staging and timing in residential heating and cooling systems. Specifically engineered as the Lennox OEM replacement part for the Honeywell ST9160B1068, this control board handles the sequencing of the internal fan to ensure proper heat exchanger cooling and improved efficiency. As a furnace fan timer control, it utilizes a fixed or adjustable delay-on-make and delay-off-break logic to prevent short cycling and optimize airflow. For technicians performing a Lennox furnace repair, this board provides the necessary 24VAC logic to bridge the thermostat demand with the line voltage blower outputs. Its robust circuitry is designed to handle the inductive loads of standard PSC motors, making it a reliable HVAC control board replacement when troubleshooting intermittent fan operation or total signal failure in older G24 and G25 series units.

Key Benefits

• Direct Compatibility: Engineered specifically to replace the ST9160B1068, ensuring a precise match for mounting footprints and wiring harness connections.
• Optimized Cycle Timing: Manages blower delays to maximize heat recovery from the heat exchanger and prevent cold drafts at the start of a cycle.
• Standardized Terminals: Features clearly labeled spade connectors for limit switches, thermostat inputs, and neutral junctions to streamline field installation.
• System Reliability: Replaces aging or failed relay logic to restore consistent fan timer board communication across the air handler.

Common Questions

Is the Lennox X8609 compatible with non-Honeywell boards?
This board is the designated service replacement for the Honeywell ST9160B1068. If the existing board carries that specific model number, the X8609 will integrate directly with the existing wiring harness.

Does this board control the inducer motor or just the blower?
The X8609 is primarily a fan timer control focused on the indoor blower motor operations. Always verify your specific furnace wiring diagram, as some setups utilize a separate integrated ignition control for the combustion air inducer.

What are the symptoms of a failing fan timer board?
Common failure points include the blower motor failing to energize during a call for heat, the fan running continuously regardless of thermostat setting, or a total lack of 24V power to the thermostat circuit.

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.