Service Technician, VRF

About the role

The AAON & LG HVAC Service Technician is responsible for the installation, support, start-up, commissioning, troubleshooting, maintenance, and repair of commercial HVAC equipment, with a primary focus on AAON and LG equipment. The technician will work directly with customers, service management, controls personnel, contractors, and manufacturers to diagnose and resolve mechanical and controls-related issues. The ideal candidate will have strong commercial HVAC experience, excellent troubleshooting skills, and the ability to work independently while maintaining a high level of customer service and professionalism.

Key Responsibilities

Service & Troubleshooting Diagnose and repair commercial HVAC equipment, including: AAON packaged rooftop units AAON air-handling equipment LG VRF systems LG heat-pump and heat-recovery systems DX and refrigeration systems Hydronic heating and cooling systems VFDs, motors, compressors, fans, and associated components Troubleshoot electrical, mechanical, refrigeration, and controls issues.

• Identify root causes rather than simply correcting symptoms.
• Perform system testing and verify proper operation after repairs.
• Start-Up & Commissioning Perform factory start-up and commissioning of AAON and LG equipment.
• Verify refrigerant charge, airflow, temperatures, pressures, electrical characteristics, safeties, and operating sequences.
• Complete manufacturer start-up documentation.

• Coordinate with controls technicians during BMS integration and functional testing.
• Assist with commissioning and troubleshooting of equipment connected to building automation systems.
• Preventive Maintenance Perform scheduled preventive maintenance on commercial HVAC equipment.
• Inspect coils, filters, belts, bearings, motors, compressors, electrical components, dampers, economizers, and refrigeration systems.

• Identify developing equipment problems and recommend corrective action.
• Provide customers with repair recommendations and equipment condition reports.
• Customer Service Communicate professionally with customers, facility managers, contractors, and other trades.
• Explain equipment problems and recommended repairs in a clear, understandable manner.
• Maintain a professional appearance and attitude while representing DMG.

• Respond to emergency and after-hours service calls as required.
• Documentation Complete accurate field service reports for every service visit.
• Document equipment condition, troubleshooting performed, readings, repairs, and recommendations.
• Include photographs, equipment information, and part numbers when appropriate.
• Maintain accurate labor, travel, and material records.

• Identify potential repair and replacement opportunities for the Service & Controls sales team.
• Required Qualifications 3+ years of commercial HVAC service experience preferred.
• Strong knowledge of commercial HVAC systems.
• Ability to read electrical schematics and wiring diagrams.
• Strong mechanical and electrical troubleshooting skills.
• Knowledge of refrigeration fundamentals.

• Ability to use electrical and HVAC diagnostic instruments.
• Valid driver's license and acceptable driving record.
• Ability to work independently and manage multiple service calls.
• Strong written and verbal communication skills.
• Ability to work safely in commercial and industrial environments.

Preferred Qualifications

• Experience servicing AAON equipment.
• Experience servicing LG VRF systems.
• AAON factory training or certification.
• LG VRF training or certification.
• Experience with equipment start-up and commissioning.
• Physical Requirements Ability to lift and carry HVAC tools and components.
• Ability to climb ladders and access rooftops.
• Ability to work in confined spaces and mechanical rooms.
• Ability to work outdoors in varying weather conditions.