Carrier HH57AC080 Sensor 320819-301 the PC board may be

the PC board may be faulty

Industrial Durability: Cast bronze construction with brass trim meets ANSI Class 250 standards for high-pressure reliability

ensuring matched port sizes and flow rates

This is a single-try ignition module

the HVAC control module maintains precise timing for gas valve energization and flame rectification

Carrier HH57AC080 Sensor 320819-301 the PC board may beThe Carrier HH57AC080 Outside Air Temperature (OAT) Sensor is a critical 10 to 20 mA diagnostic and control component designed for Carrier, Bryant, and Payne commercial rooftop units equipped with Economi$er IV systems. Use this sensor to restore or enable outdoor air dry bulb changeover, allowing the controller to determine when ambient conditions are suitable for free cooling. By providing a precise 4 20 mA signal back to the main control board, the