Title
Troubleshooting an L-862(L), L-862E(L), High Intensity LED Runway Light/ L861SE(L) Medium Intensity LED Edge Light
URL Name
Troubleshooting-an-L-862-L-L-862E-L-High-Intensity-LED-Runway-Light
Summary
This article presents the troubleshooting table for common symptoms and corrective actions on the L-862(L) and L-862E(L) High Intensity LED Runway Light, along with instructions for contacting technical support.
Owner
Mike S

Question

What corrective action is taken if the L-862 fixture does not illuminate?

How do you troubleshoot no light output on the L-862 LED runway light?

What steps address intermittent operation of the L-862 fixture?

Why might the L-862 show reduced intensity and what is the fix?

What causes the L-862 to operate at incorrect intensity steps?

How is a failed light engine diagnosed in the L-862 series?

What troubleshooting step applies if the L-862 does not respond to dimming?

What should be checked if the arctic kit heater does not function on the L-862?

How do you verify the Plug and Know controller is operating correctly in the L-862?

What is the first action when troubleshooting any L-862 malfunction?

When should technical support be contacted for the L-862 LED light?

What information should be provided when calling support for L-862 issues?

What phone number is used for Airport Lighting Company technical support?

What email address is used for L-862 troubleshooting assistance?

Where is the troubleshooting table located in the L-862 owner's manual?

Content

Overview

This article walks you though how to troubleshoot an LED High Intensity Light. You can also view a more guided flow style walkthrough by using the link below. Select L862 from the product guides dropdown box.

Guided Product Troubleshooting

 

Identify the Symptoms

  • Record the symptoms.

    • Is the issue on one side only, or both sides?
    • Is the light dim (noticeably weaker than normal), flickering/intermittent, or going on and off randomly?
    • Does it happen only on one intensity or all?
    • Was there any environmental factors?
    • Are there any signs of water intrusion?

General Troubleshooting Notes

De-energize before performing any troubleshooting or replacement. Use insulated tools and follow lockout/tagout procedures.
Record fixture catalogue number, serial number, and observed symptoms.

The easiest way to isolate the problem is to take known good parts and swap each part one by one. It is recommended to keep spare parts on hand for this purpose, otherwise you can use a donor fixture. Use the table below to choose order of tests based on symptoms.

 
 
 
 

 

Symptom

Possible Cause

Corrective Action

No illumination

No power to fixture

Failed light engine(s)

Failed power and control board

Open circuit on thermostat wires
(Arctic Kit)

Failed isolation transformer

Verify Isolation Transformer Output Current / Fixture Input Current

Replace the Light Engine

Replace the Power and Control Board

Check wiring, while energized press on wires where thermostat connects to the light engines, observe any change. Replace the light engine if necessary

Replace transformer

 

Partial illumination

Failed light engine

Failed power and control board

Open circuit on thermostat wires
(Arctic Kit)

Replace the Light Engine

Replace the Power and Control Board

Check wiring, while energized press on wires where thermostat connects to the light engines, observe any change. Replace the light engine if necessary

Intermittent operation

Loose connections

Circuit degradation

Failing isolation transformer

Verify Isolation Transformer Output Current / Fixture Input Current

Inspect and tighten all connections

Megger Test

Replace transformer

Reduced intensity

Dirty or damaged lens

Degraded LED output.

Degraded Power and Control Board

Clean or replace lens

Performing Megger Testing for Airfield Lighting Systems

Replace the Power and Control Board


Airport Lighting Company | Troubleshooting Instruction

Internal Notes

Digital Engagement Response

Article Created Date
2/23/2026, 3:46 PM
Publication Status
Published
Created Date
3/5/2026, 4:12 PM
Article Total View Count
70
Created By
Mike S, 3/5/2026, 4:12 PM
Archived Date
Last Modified Date
3/5/2026, 4:12 PM
Last Modified By
Mike S, 3/5/2026, 4:12 PM
Last Published Date
3/5/2026, 4:12 PM

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Troubleshooting Test

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