Modine 5H0794410002 Pressure Switch

The Modine 5H0794410002 Pressure Switch is the current OEM replacement for the legacy 5H79441-2 and is a critical safety component for high-efficiency unit heaters. Rated at .70" WC with an SPST (Single Pole Single Throw) configuration, this switch acts as the primary proof of airflow for the combustion process. It ensures the power exhauster is generating sufficient vacuum before allowing the ignition sequence to proceed, preventing hazardous operation under blocked vent conditions. Engineered for compatibility with Modine Hot Dawg and industrial series units, it features a factory-installed mounting bracket and standard 1/4 inch spade terminals for rapid field installation. For veteran contractors, this switch provides the OEM-grade precision required to resolve one-flash diagnostic codes on control boards, ensuring the furnace maintains safe draft pressure throughout the heating cycle. Its robust construction is designed to withstand the thermal cycling typical of warehouse and garage heating environments.

• Precise Draft Monitoring: Calibrated specifically to a .70" Water Column setpoint to meet factory airflow specifications.
• Universal Compatibility: Directly replaces part 5H79441-2; fits popular Modine models including HDS45, BTS150, PTS175, and PTC260.
• Streamlined Installation: Includes an integrated mounting bracket for direct fitment into existing cabinet pre-drills.
• Combustion Safety: SPST switch logic ensures the inducer motor is functioning correctly before the gas valve is energized.

How do I troubleshoot a 'One Flash' code on my Modine heater?
A single flash typically indicates the pressure switch is failing to close. Check for obstructions in the vent pipe, debris in the inducer sampling port, or a cracked silicone tube before replacing the switch.

Can I use an adjustable pressure switch or a different WC rating?
No. Using a switch with an incorrect WC rating can lead to incomplete combustion or dangerous delayed ignition. Always use the OEM 5H0794410002 to ensure the unit operates within its design parameters.

Does this switch work on both natural gas and propane units?
Yes, the 5H0794410002 pressure switch monitors flue pressure and is independent of fuel type; it is compatible with both NG and LP Modine configurations.

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.