Carrier LH33WZ513 Ignitor Module

The Carrier LH33WZ513 Ignitor Module is a critical OEM replacement ignition control designed for precise pilot gas valve control and spark ignition in Carrier, Bryant, and Payne furnaces. As the direct replacement for the LH33WZ513A, this module features integrated electronic lockout timing and a prepurge spark delay circuit (8 to 21 seconds) to ensure the combustion chamber is cleared before ignition. Engineered for 24VAC systems, it manages flame-failure-reignition in under 0.8 seconds, maintaining system safety and operational continuity. Technicians utilize this lockout control module to resolve persistent ignition failure codes and flickering pilot burners. Built to withstand demanding thermal environments, the unit operates reliably between -40°F and 185°F. Using genuine Carrier parts ensures 1:1 compatibility with original wiring harnesses, preventing the common mismatched spark frequency or voltage drop issues associated with generic universal controls.

• Direct OEM Compatibility: Specifically engineered to replace LH33WZ513A and 310353-702, ensuring exact physical fit and electrical mapping.
• Integrated Safety Lockout: Features a 240 to 360-second lockout time to prevent gas accumulation if the pilot fails to establish.
• Advanced Timing Logic: Includes a factory-set prepurge delay and a 90-second maximum flame-establishing period for consistent furnace ignition.
• High-Voltage Precision: Delivers a minimum 17.5 KV peak open circuit spark voltage to ensure natural gas or propane ignition even in cold-start conditions.

Is the LH33WZ513 compatible with propane systems?
Yes, this ignition control board is design-certified for use with both natural gas and liquid propane (LP) configurations.

What does it mean if the module enters lockout mode?
If the flame sensor does not detect a pilot flame within the 90-second trial period, the module closes the gas valve relay. This usually indicates a dirty pilot orifice, a cracked electrode, or a faulty ground connection.

How do I verify if the module is receiving power?
Check for 24VAC across the input terminals. If power is present but there is no spark after the prepurge delay, verify the high-voltage lead and spark gap (0.125 to 0.187 in) before condemning the module.

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.