JLG Telehandler 8514 Fault Code: Load Moment - LSI Not Calibrated
Also called LSI Not Calibrated
Load Moment - LSI Not Calibrated · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Fault 8514 means the Load Sensing Indicator (LSI) system has told the UGM controller over the CAN network that it has not been calibrated. The UGM detects this within 1500 ms of system power on and lets the LSI display control its own alarm. This indicates machine system distress and should be treated as a load moment safety issue until calibration is completed.
High severity. The LSI system monitors load moment to help prevent tip-over or overload conditions. If it is not calibrated, the machine may not warn the operator properly about unsafe load or boom conditions. Operation should not continue with lifting functions until calibration is verified and completed.
What does JLG Telehandler error code 8514 mean?
Fault code 8514 is set by the UGM (the machine's main controller) when it reads a CAN message from the LSI (Load Sensing Indicator) system reporting that calibration has not been performed. The LSI system is responsible for monitoring load moment, essentially tracking how boom position and load weight combine to affect machine stability.
When this fault is active, the UGM's response is to permit the LSI-CAN display to control its own internal alarm rather than overriding it. This means the operator will see and hear warnings directly from the LSI display itself.
This is listed under 'Machine system distress' indicators, meaning it is considered a condition that affects the safe operating status of the machine, not just a nuisance code.
What triggers a JLG Telehandler 8514 code?
Within 1500 ms of system power on, the UGM reads a CAN message from the LSI system indicating that calibration has not occurred. The fault latches until the LSI system's CAN message calibration mode status changes to OFF, meaning the calibration sequence has been completed.
Common causes of 8514
- The LSI system has never been calibrated since installation or replacement.
- A prior calibration was interrupted or not completed successfully, leaving the LSI system in an uncalibrated state.
- The LSI module or display was replaced or reset, clearing prior calibration data.
- A CAN communication issue caused the calibration status message to read as incomplete even if calibration was previously done.
How to troubleshoot JLG Telehandler 8514: first checks
- Check the LSI display for any on-screen message or prompt indicating calibration is required.
- Inspect CAN wiring and connectors between the LSI system and the UGM for corrosion, looseness, or damage.
- Confirm whether the LSI module or display was recently replaced or serviced, which would explain a loss of calibration data.
- Verify the machine has power cycled correctly and that the LSI system is communicating on the CAN network at all before assuming a calibration issue.
How the code clears
No reset procedure beyond calibration is listed for this code. The fault is not separately latched and cleared by a technician command. Instead, it remains active until the LSI system's own CAN message reports that calibration mode status has changed to OFF, which happens once the full calibration sequence has been performed on the LSI system. Once calibration completes, the LSI display will indicate completion and the fault condition resolves on its own.
Frequently asked questions
What does JLG fault code 8514 mean?
It means the LSI (Load Sensing Indicator) system reported to the UGM controller that it has not been calibrated. The UGM detects this within 1500 ms of power on and lets the LSI display handle its own alarm.
Is it safe to operate the telehandler with fault 8514 active?
This is listed as a machine system distress indicator affecting the load moment monitoring system. Since the LSI system helps warn against unsafe load and boom conditions, it is best not to rely on lifting functions until calibration is completed.
How do I clear fault code 8514?
There is no separate reset command. The fault clears on its own once the LSI system's calibration mode status changes to OFF, meaning the calibration sequence has been performed successfully.
Why would the LSI system lose its calibration?
Common reasons include a new or replaced LSI module or display, an interrupted calibration sequence, or a CAN communication problem that makes the system appear uncalibrated even if it was previously set up correctly.
Does fault 8514 point to a wiring problem or a calibration problem?
It is primarily a calibration status message, but if you're sure calibration was completed before, check the CAN wiring and connectors between the LSI system and the UGM, since a communication fault could cause the calibration status to read incorrectly.
What should I check first when I see fault code 8514?
Start by looking at the LSI display for a calibration prompt, then confirm if the module or display was recently replaced, and inspect CAN connections before assuming a full calibration is required.