Hands-On Learning, Powering America Forward

Diagnosing and Replacing Potential Relay 

 

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CONTENT TYPE

VR, ILV, Interactive Modules

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DURATION

2.5 Hours

Target Audience icon

TARGET AUDIENCE

Technician

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COURSE DELIVERY

VR and Web-based

Credits icon

Credits : 0.3

Icons representing a four-step workflow: Learn, Assess, Evaluate, and Implement

 

About the Course:

This Diagnosing and Replacing Potential Relay microcredential trains HVAC technicians to safely diagnose, remove, and replace a faulty potential relay in air conditioning and refrigeration systems. Learners practice real-world electrical troubleshooting steps including disconnect isolation, resistance testing using a multimeter (ohms setting), wire removal, and secure component installation. 

The course emphasizes safe lockout procedures, accurate relay testing, proper wiring reconnection, and final system verification to ensure reliable compressor start-up and overall system performance. Technicians looking to strengthen their electrical troubleshooting expertise can further develop their skills through our Online HVAC Technician Certification Program, focused on advanced HVAC system diagnostics and field repair.

Learning Objectives:

  • Identify symptoms of potential relay failure, including compressor start issues 

  • Reconnect wiring correctly and restore power safely 

  • Install and secure a compatible replacement relay 

  • Remove faulty relays using proper tools and electrical safety practices 

  • Interpret OL (open loop) readings to confirm relay failure 

  • Use a multimeter set to ohms to test relay continuity 

  • Safely isolate power using the disconnect box before servicing 

 

Course delivered via LMS and requires an Oculus VR headset for hands-on VR simulations.

 

HVAC technician diagnosing a potential relay using a multimeter during electrical troubleshooting.

 

Workforce Development

Replacing a faulty HVAC potential relay in an air conditioning compressor control circuit.

At ImmerseLearn, we equip HVAC technicians with hands-on, job-ready skills for servicing cooling and refrigeration systems. This microcredential strengthens electrical troubleshooting accuracy, safety compliance, and component replacement precision through immersive VR practice. If you are just starting out in HVAC, our Online HVAC Training is a structured way to build essential skills and begin your career in the HVAC industry. 

How this course strengthens workforce skills:

Relay Diagnostics −
Learn how to test a potential relay by safely isolating power, disconnecting wires, and using a multimeter set to resistance (ohms). Technicians interpret OL readings to confirm an open circuit condition, ensuring accurate diagnosis before replacement. This reduces unnecessary part swaps and prevents compressor damage.
Safe Isolation and Testing Procedures +
Practice critical safety steps including opening the disconnect box, removing the disconnect, safely detaching wires using pliers, and restoring power only after secure installation. Emphasis is placed on correct sequencing to prevent electrical shock and equipment failure.
Cause Identification +
Understand common causes of potential relay failure such as electrical wear, contact burnout, coil failure, or overheating. By analyzing resistance readings and system symptoms, technicians make informed replacement decisions.
Replacement and Verification +
Remove the faulty relay by loosening the mounting screws, install a compatible new relay, and tighten all connections securely. Reattach the wiring correctly, restore the disconnect, close the disconnect box, and verify successful compressor start-up and overall system performance, completing the process by confirming reliable operation in a safe, controlled environment that mirrors real-world service calls.

By completing this microcredential, HVAC technicians build the confidence and technical expertise needed to diagnose potential relay failures, replace components safely, and restore dependable system performance in residential and commercial HVAC environments.