The Carrier LH33CZ007 is a mission-critical 24V intermittent ignition control module engineered for high-reliability startups in Carrier, Bryant, and Payne gas furnaces. Built to professional standards, this direct spark ignition (DSI) module features a precise 120-second trial for ignition (TFI) period, ensuring optimal gas flow stabilization and eliminating dangerous unburned fuel accumulation. For technicians troubleshooting furnace ignition failure or a repetitive ignition lockout (Status Code 14), this OEM replacement provides the exact timing and voltage regulation required to restore HVAC system performance without the need for field calibration.

This solid-state ignition control operates on a standard 24VAC 60Hz input and is specifically optimized for intermittent pilot ignition systems. It utilizes a 4-second prepurge cycle to clear the combustion chamber and supports a continuous 2-amp load (5-amp inrush). Designed for rugged environments, the LH33CZ007 ignition board maintains operational integrity in ambient temperatures ranging from -40°F to 160°F. Whether you are performing a furnace component test or replacing a burnt-out furnace control board, this module ensures seamless logic integration with your existing gas valve solenoid and limit switches.

• OEM Compatibility: Exact drop-in replacement for Carrier LH33CZ007, ensuring no wiring modifications are necessary.
• Safety Logic: Integrated lockout protection shuts down the system after failed attempts, preventing hazardous gas buildup.
• Diagnostic Reliability: Built to interface with the furnace status LED for fast, accurate troubleshooting of low flame signal issues.
• Heavy-Duty Relays: Robust internal switching handles high-inrush currents common in commercial HVAC equipment.

Why is the ignition module humming but not sparking?

Check the spark gap (should be approximately 0.1 in.) and inspect the igniter cable for insulation breakdown. If the module is receiving 24V at the input terminals but fails to produce a high-voltage discharge, the internal step-up transformer has likely failed.

What causes a "Flame Proving Failure" (Code 34)?

Ensure the flame sensor is clean and positioned correctly in the burner path. The Carrier LH33CZ007 requires a minimum microamp signal to hold the gas valve open; if the sensor is carbon-fouled, the module will terminate the cycle after the 120-second trial.

Item is Non Cancelable / Non Returnable

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.