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

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**Service & Troubleshooting

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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

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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

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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

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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

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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

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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

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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

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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.