Robertshaw 780-783 Ignition Module

The Robertshaw 780-783 is a critical HSI ignition module engineered for high-demand gas-fired heating systems and commercial cooking applications. As a direct replacement for the HS78034PL308A, this unit utilizes standard 120V AC supply voltage and 24V AC control voltage to provide reliable hot surface ignition. Designed for versatile field application, it supports both local and remote flame sensing, ensuring a stable flame rectification signal during the heating cycle. The integrated 34-second prepurge and 34-second ignitor warm-up timing provides a safety-first startup sequence, while the 8-second valve trial time prevents uncontrolled gas flow. With a compact footprint and molded-in terminal barriers, this module is built for quick installation in tight electrical cabinets where HVAC replacement parts must meet strict physical and technical tolerances.

• Universal gas furnace ignition control compatibility reduces truck stock requirements for 780 Series HSI applications.
• Robust flame sensing logic with 3 attempts before lockout ensures system reliability in variable conditions.
• Standardized 1.5 Amp main valve rating is compatible with most 24V AC intermittent pilot and HSI gas valves.
• Wide ambient operation range from -40°F to 176°F handles extreme mechanical room environments.
• Simplified Robertshaw 783 troubleshooting thanks to clear diagnostic paths and diagnostic-friendly terminal layouts.

• How do I reset the module after a lockout? Open the thermostat or system switch for at least 10 seconds to reset the solid-state logic.
• What is the correct ignitor resistance? Most compatible hot surface ignitors should read between 40 and 60 ohms; significantly higher resistance usually indicates a failing element.
• Is this compatible with LP gas? Yes, the 780-783 is rated for use with both natural gas and liquid propane systems.

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.