Carrier LH33CM600 Ignition Module

Professional-grade furnace ignition module replacement for Carrier, Bryant, and Payne systems. The Carrier LH33CM600 Ignition Module is the designated OEM replacement for the obsolete P361-3904 and LH33CM500 controllers. This intermittent pilot ignition control is engineered for direct mounting on Penn valves EF33CZ206 and EF33CZ209, simplifying field retrofits and repairs. Designed to manage the ignition sequence and supervise flame sensing, this module ensures reliable burner operation in Carrier gas furnace units and packaged RTUs.

Built for high-demand HVACR environments, the Carrier LH33CM600 provides precise electronic signal modulation to control the firing sequence and gas valve current delivery. Its robust construction helps eliminate common ignition failures such as intermittent heating or failed sparks. Technical specifications include a compact form factor (approx. 5.7" x 4.4"), a standard 24V input requirement, and CSA listing for safety compliance. This module is a drop-in solution for contractors needing to restore factory-spec performance to older BDP ignition systems without modernizing the entire valve train.

Key Benefits for Technicians:

• Direct Replacement: Specifically engineered to replace P361-3904 and 301121-701 with zero mounting modifications.
• Valve Compatibility: Optimized for seamless integration with Penn EF33CZ-series valves.
• System Reliability: Advanced flame sensing circuitry reduces nuisance lockouts in residential and light commercial equipment.
• OEM Integrity: Maintains original equipment manufacturer engineering standards for timing and safety parameters.

Common Questions:

Is the LH33CM600 compatible with my older P361-3904 module?
Yes, the Carrier LH33CM600 is the official direct replacement for the P361-3904 and several older ICP/BDP part numbers, including 301017-101 and 301480-101.

Can this module be used with direct spark ignition (DSI) systems?
No, this specific module is designed for intermittent pilot ignition systems. Always verify your current ignition type before installation.

What are the symptoms of a failing ignition module?
Common indicators include the furnace failing to spark, intermittent burner firing, or the module failing to sense the flame after successful ignition.

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.