Lennox 30W33 Ignition Module Kit

The Lennox 30W33 Ignition Module Kit is a field-proven intermittent pilot ignition control engineered for high-reliability performance in compatible gas-fired furnaces and boilers. This genuine OEM Lennox replacement part is a direct 24V solution designed to replace obsolete controls, including Lennox 18G9101 and 18G91. It is technically identical to Lennox 30W3301 and provides a standardized 30-second pre-purge (30sPP) followed by a 90-second trial for ignition (90sTFI) to ensure safe and efficient combustion sequences.

Constructed by Honeywell (Model S8670K3000), this kit includes the 49L76 flame sensor, specialized wiring harnesses, and a dedicated control bracket to streamline the conversion from older Johnson Controls or Baso systems. Technical professionals appreciate the LED diagnostic flash codes, which allow for rapid troubleshooting of common issues such as flame out of sequence, low input voltage, or internal errors. The continuous retry logic enhances system uptime by attempting re-ignition automatically if the flame signal is lost during a heating cycle.

Key Benefits for Contractors

• Broad Compatibility: Serves as the primary furnace ignition module replacement for over 30 legacy Lennox part numbers, reducing the need for multiple truck-stock SKUs.
• Comprehensive Kit: Includes the intermittent pilot control, flame sensor, heat shield, and a detailed wiring diagram for precise field installation.
• Advanced Diagnostics: Integrated LED status indicators provide real-time feedback on system health and flame sensing accuracy.
• OEM Reliability: Ensures factory-spec 24V spark ignition timing and amperage ratings (PV: 1A, MV: 2A Max) for safe appliance operation.

Common Questions

Is the 30W33 a direct replacement for the Lennox 18G9101?
Yes, the 30W33 is the industry-standard direct replacement for the 18G9101 and the older 18G91 modules. It is also functionally identical to the 30W3301.

How do I troubleshoot a 2-flash code on this module?
A 2-flash LED code indicates that the module has entered a retry state. This typically suggests the flame sensor is not detecting a pilot flame within the 90sTFI window or there is an issue with the spark ignition lead.

What is the purpose of the 30-second pre-purge?
The 30sPP cycle clears the combustion chamber of any residual gas and verifies the pressure switch state before the intermittent pilot begins the sparking process, ensuring a clean and safe start.

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.