Hands-On Learning, Powering America Forward

Diagnosing and Replacing Flame Sensor

 

 

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CONTENT TYPE

VR, ILV, Interactive Modules

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DURATION

3 Hours

Target Audience icon

TARGET AUDIENCE

Technician

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COURSE DELIVERY

VR and Web-based

Credits icon

Credits : 0.4

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About the Course:

This Diagnosing and Replacing Flame Sensor microcredential trains HVAC technicians to safely diagnose, remove, and replace flame sensors in gas-fired furnaces. Learners gain hands-on practice identifying flame sensor faults through electrical testing and operational symptoms, then follow correct removal and installation procedures. The course emphasizes safety, accuracy, and verification to ensure reliable furnace ignition and operation. Enroll in our HVAC Technician Training Program to build advanced HVAC expertise and hands-on skills.

Learning Objectives:

  • Identify common symptoms of a faulty flame sensor (ignition failure, short cycling, furnace lockout).

  • Use a multimeter to test flame sensor voltage and confirm failure.
  • Follow proper safety procedures, including powering down the furnace and shutting off the gas supply.
  • Safely remove a faulty flame sensor using correct tools and techniques.
  • Install a new flame sensor, reconnect wiring, and secure mounting hardware.
  • Restore power and gas and verify proper furnace operation after replacement.

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

 

HVAC technician diagnosing flame sensor in a gas furnace for safe operation

 

Workforce Development

Electrical testing of furnace flame sensor with multimeter by trained HVAC technician

At ImmerseLearn, we prepare HVAC technicians for real-world furnace diagnostics and repair tasks. This microcredential focuses on safe troubleshooting, electrical testing accuracy, and precise component replacement skills critical for maintaining efficient and reliable heating systems.

How this course strengthens workforce skills:

Flame Sensor Diagnostics −
Learn how to diagnose flame sensor issues using visual inspection and multimeter voltage readings. Technicians practice identifying improper sensor signals that prevent furnaces from maintaining a stable flame, helping reduce unnecessary component replacements and service callbacks.
Safe Shutdown and Removal Procedures +
Practice proper system shutdown by turning off furnace power and isolating the gas supply. Learners safely remove the flame sensor using standard hand tools while protecting surrounding components and wiring.
Cause Identification +
Identify root causes of flame sensor failure, including contamination, wear, improper grounding, or electrical faults. Understanding these causes helps technicians prevent repeat failures and improve long-term system performance.
Replacement and Verification +
Select and install the correct flame sensor, secure it properly, and reconnect wiring. Restore power and gas, then verify ignition and furnace operation to confirm a successful repair and safe system performance.

By completing this microcredential, HVAC technicians will build the confidence and technical skills needed to diagnose, replace, and verify flame sensors safely and effectively ensuring consistent furnace ignition, improved reliability, and customer satisfaction. For learners new to HVAC fundamentals, you may begin with foundational training through our HVAC Associate Program.