Controls/ Service Technician

InfraHire; Mobile (AL); On-site; USD 45,000 - 65,000; Full time

Job summary

InfraHire is seeking a Controls/Service Technician to service commercial DDC systems in Mobile, AL. You will diagnose issues with controllers, sensors, actuators, wiring, and networks while supporting startups and commissioning tasks.

Responsibilities include verifying HVAC control sequences, documenting service work, and communicating with customers on repairs and recommendations. Knowledge of Niagara/Tridium and major brands will help you succeed.

Qualifications

• Knowledge of commercial HVAC control systems and DDC platforms.
• Ability to diagnose and repair controllers, sensors, actuators, and field devices.
• Experience with communication protocols (BACnet, Modbus) is a plus.
• Proficiency reading control drawings and wiring diagrams.
• Strong communication with customers and documentation of service work.

Responsibilities

• Service, troubleshoot, repair, and maintain commercial DDC systems.
• Diagnose issues with controllers, sensors, actuators, field devices, wiring, and networks.
• Perform point-to-point checkout, system startups, commissioning support, and testing.
• Troubleshoot HVAC control sequences for proper operation.
• Coordinate with engineering/project/installation teams as needed.
• Document work, findings, and recommendations clearly.

Skills

HVAC controls

Field troubleshooting

Reading wiring diagrams

System commissioning

Customer communication

Tools

Niagara/Tridium

Honeywell

Schneider Electric

Johnson Controls

Siemens equipment

Job description

Job Summary (List Format) Controls/Service Technician (Mobile, AL)

• Service, troubleshoot, repair, and maintain commercial DDC (Direct Digital Control) systems.
• Diagnose and resolve issues with controllers, sensors, actuators, field devices, wiring, and communication networks.
• Perform point-to-point checkout, system startups, commissioning support, and functional testing.
• Troubleshoot and verify HVAC control sequences for proper system operation.
• Work with building automation systems (Niagara, Honeywell, Schneider, or similar platforms).
• Troubleshoot and support communication protocols (BACnet, Modbus, etc.).
• Conduct preventive maintenance, system tuning, and control optimization for performance improvement.
• Identify system deficiencies, recommend repairs, and assist with upgrades or new service opportunities.
• Communicate clearly and professionally with customers about system issues, repairs, and recommendations.
• Accurately document service work, findings, repairs, deficiencies, and recommendations.
• Coordinate with engineering, project, and installation teams as needed for additional support.
• Maintain a professional, safe, and customer-focused approach at all client sites.
• Work independently in the field and demonstrate strong problem-solving and technical skills.
• Read and interpret control drawings, wiring diagrams, and technical documentation.
• Possess a valid driver s license.
• Preferred: Experience with commercial HVAC controls, low-voltage wiring, various DDC systems (Niagara/Tridium, Honeywell, Schneider, Johnson Controls, Siemens, etc.), and equipment (VAVs, AHUs, RTUs, boilers, chillers, pumps).