Lennox 91J88 Control Board
As a seasoned technician, you know that a failing Lennox 91J88 Control Board is often the culprit behind intermittent ignition or irregular blower cycles. This ICM gas furnace control board is a high-performance OEM replacement part designed to manage critical sequences, including ignitor warm-up, gas valve timing, and inducer motor speed. Engineered for 120V and 24V applications, it integrates microprocessor-based logic to ensure precise flame rectification and system safety monitoring. By replacing a legacy SureLight ignition control with this specific module, you restore reliable communication between the thermostat and the air handler. The board features standard Molex plug connections and diagnostic LEDs to streamline troubleshooting, allowing you to identify pressure switch issues or flame signal loss immediately. Built for durability in high-cycle environments, this integrated furnace control board provides the robust electrical regulation necessary to maintain efficiency in Lennox HVAC systems without the risk of the phantom "E125" internal error codes common in older, failing units.
Key Benefits for the Contractor:
- Precise Ignition Control: Manages hot surface igniter ramp-up and gas valve synchronization for reliable combustion every cycle.
- System Compatibility: Direct OEM replacement for Lennox parts 91J88 and LB-86481, ensuring the board fits existing mounting points.
- Advanced Diagnostics: Features on-board LEDs that flash specific fault codes, reducing time spent on HVAC troubleshooting.
- Blower Timing Flexibility: Adjustable fan-off delay settings help maximize heat extraction from the heat exchanger after the call for heat ends.
- Robust Circuitry: Designed to withstand the electrical loads of 208-230V and standard 120V furnaces, providing stable 24V power to the thermostat.
Common Questions:
Does this board replace the old Lennox SureLight modules?
Yes, the 91J88 is the standard replacement for many SureLight and older IMC electric heat control units. Ensure you verify the pin configuration on your current terminal block before installation.
What should I check if the diagnostic LED is flashing rapidly?
A rapid flash typically indicates a polarity issue or a lack of proper grounding. Technicians should always verify 120V polarity and check for a secure common ground to ensure the flame sensing circuit operates correctly.
Can I use this board for two-stage heating systems?
This specific model is primarily designed for integrated single-stage furnace control. For two-stage variable speed units, please verify against the specific wiring diagram for your model number.
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.
Original: $84.88
-65%$84.88
$29.71Lennox 91J88 Control Board
As a seasoned technician, you know that a failing Lennox 91J88 Control Board is often the culprit behind intermittent ignition or irregular blower cycles. This ICM gas furnace control board is a high-performance OEM replacement part designed to manage critical sequences, including ignitor warm-up, gas valve timing, and inducer motor speed. Engineered for 120V and 24V applications, it integrates microprocessor-based logic to ensure precise flame rectification and system safety monitoring. By replacing a legacy SureLight ignition control with this specific module, you restore reliable communication between the thermostat and the air handler. The board features standard Molex plug connections and diagnostic LEDs to streamline troubleshooting, allowing you to identify pressure switch issues or flame signal loss immediately. Built for durability in high-cycle environments, this integrated furnace control board provides the robust electrical regulation necessary to maintain efficiency in Lennox HVAC systems without the risk of the phantom "E125" internal error codes common in older, failing units.
Key Benefits for the Contractor:
- Precise Ignition Control: Manages hot surface igniter ramp-up and gas valve synchronization for reliable combustion every cycle.
- System Compatibility: Direct OEM replacement for Lennox parts 91J88 and LB-86481, ensuring the board fits existing mounting points.
- Advanced Diagnostics: Features on-board LEDs that flash specific fault codes, reducing time spent on HVAC troubleshooting.
- Blower Timing Flexibility: Adjustable fan-off delay settings help maximize heat extraction from the heat exchanger after the call for heat ends.
- Robust Circuitry: Designed to withstand the electrical loads of 208-230V and standard 120V furnaces, providing stable 24V power to the thermostat.
Common Questions:
Does this board replace the old Lennox SureLight modules?
Yes, the 91J88 is the standard replacement for many SureLight and older IMC electric heat control units. Ensure you verify the pin configuration on your current terminal block before installation.
What should I check if the diagnostic LED is flashing rapidly?
A rapid flash typically indicates a polarity issue or a lack of proper grounding. Technicians should always verify 120V polarity and check for a secure common ground to ensure the flame sensing circuit operates correctly.
Can I use this board for two-stage heating systems?
This specific model is primarily designed for integrated single-stage furnace control. For two-stage variable speed units, please verify against the specific wiring diagram for your model number.
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.
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Description
As a seasoned technician, you know that a failing Lennox 91J88 Control Board is often the culprit behind intermittent ignition or irregular blower cycles. This ICM gas furnace control board is a high-performance OEM replacement part designed to manage critical sequences, including ignitor warm-up, gas valve timing, and inducer motor speed. Engineered for 120V and 24V applications, it integrates microprocessor-based logic to ensure precise flame rectification and system safety monitoring. By replacing a legacy SureLight ignition control with this specific module, you restore reliable communication between the thermostat and the air handler. The board features standard Molex plug connections and diagnostic LEDs to streamline troubleshooting, allowing you to identify pressure switch issues or flame signal loss immediately. Built for durability in high-cycle environments, this integrated furnace control board provides the robust electrical regulation necessary to maintain efficiency in Lennox HVAC systems without the risk of the phantom "E125" internal error codes common in older, failing units.
Key Benefits for the Contractor:
- Precise Ignition Control: Manages hot surface igniter ramp-up and gas valve synchronization for reliable combustion every cycle.
- System Compatibility: Direct OEM replacement for Lennox parts 91J88 and LB-86481, ensuring the board fits existing mounting points.
- Advanced Diagnostics: Features on-board LEDs that flash specific fault codes, reducing time spent on HVAC troubleshooting.
- Blower Timing Flexibility: Adjustable fan-off delay settings help maximize heat extraction from the heat exchanger after the call for heat ends.
- Robust Circuitry: Designed to withstand the electrical loads of 208-230V and standard 120V furnaces, providing stable 24V power to the thermostat.
Common Questions:
Does this board replace the old Lennox SureLight modules?
Yes, the 91J88 is the standard replacement for many SureLight and older IMC electric heat control units. Ensure you verify the pin configuration on your current terminal block before installation.
What should I check if the diagnostic LED is flashing rapidly?
A rapid flash typically indicates a polarity issue or a lack of proper grounding. Technicians should always verify 120V polarity and check for a secure common ground to ensure the flame sensing circuit operates correctly.
Can I use this board for two-stage heating systems?
This specific model is primarily designed for integrated single-stage furnace control. For two-stage variable speed units, please verify against the specific wiring diagram for your model number.
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.
