JLG Scissor Lift 823 Fault Code: LSS Cell #3 Error
Also called Platform Load Sense - LSS Cell #3 Error
LSS Cell #3 Error · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Fault 823 means the JLG UGM has detected an error from Load Sense System (LSS) load cell #3 while the platform is active and attached. The machine treats this as a system distress condition, locks out lift, telescope, rotate, and level functions, and shows a platform overloaded screen until the controller is power cycled.
High severity. The machine disables lift up/down, telescope in/out, platform rotate, and platform level functions and displays a platform overloaded warning. It will not clear on its own and requires a power cycle, so operation is stopped until the load sense fault is resolved.
What does JLG Scissor Lift error code 823 mean?
Fault 823 is a Load Sense System (LSS) error tied specifically to load cell #3 on the platform. The LSS is what the machine uses to detect platform load and prevent operation when the platform is overloaded or when the load sensing circuit itself is unreliable.
When the UGM (the machine's main controller) sees the platform station active, the platform option enabled, a platform attached, and an error reported from LSS cell #3, it assumes it cannot trust the load reading. Rather than risk an undetected overload, it shuts down the functions that move the platform.
This is a protective lockout, not a simple warning. The controller disables lift up, lift down, telescope in, telescope out, platform rotate left, platform rotate right, platform level up, and platform level down. It also deactivates the platform module's function enable relay at J2-19 and displays a platform overloaded screen on the cabin LCD. The fault latches until the machine is power cycled.
What triggers a JLG Scissor Lift 823 code?
The fault sets when the UGM detects all of the following at once: the platform station is active, the platform option is enabled, a platform is detected as attached, and the LSS module reports an error specifically for load cell #3.
Common causes of 823
- A fault or internal error reported by the LSS module for load cell #3 specifically.
- Wiring or connection problems between the LSS module and load cell #3 that prevent a valid reading.
- A failed or degraded load cell #3 sensor itself.
- General problems with the load sense system that the controller cannot resolve, since the OEM check for this code lists no further diagnostic detail beyond 'a problem has been detected with the load sense system.'
How to troubleshoot JLG Scissor Lift 823: first checks
- Inspect the wiring harness and connectors running to load cell #3 for damage, corrosion, or loose pins.
- Confirm the platform is correctly attached and seated, since the fault only sets when a platform is detected as attached.
- Look for other active fault indicators on the LSS module or UGM that might point to a specific cell or circuit issue.
- Check that no physical damage or debris is interfering with load cell #3 or its mounting.
- If accessible, check LSS module status or diagnostic outputs for cell #3 specifically, since the fault is isolated to that cell rather than the whole load sense system.
How the code clears
This fault latches until a power cycle. No separate clearing step or reset procedure is listed beyond power cycling the machine. If the underlying LSS cell #3 error is still present after the power cycle, the fault will likely reset again once the platform station is active with a platform attached.
Frequently asked questions
What does JLG fault code 823 mean?
It means the JLG UGM controller detected an error from load cell #3 in the platform's Load Sense System while the platform was active, enabled, and attached. The machine responds by locking out platform movement functions and showing a platform overloaded screen.
Why did my JLG scissor lift stop moving and show a platform overloaded screen?
If fault 823 set, the controller disabled lift, telescope, rotate, and level functions and displayed the platform overloaded screen because it could not trust the reading from LSS load cell #3, even if the platform is not actually overloaded.
Will fault 823 clear itself?
No. It latches until the machine is power cycled. There is no separate reset procedure listed for this code.
Is fault 823 the same as a real overload?
Not necessarily. It indicates an error reported by load cell #3 in the load sense system, which can be caused by a wiring issue or sensor fault rather than an actual excess load on the platform.
What should I check first if I get an 823 fault?
Start with the wiring and connectors to load cell #3, confirm the platform is properly attached, and look for any other related fault indicators on the LSS module before assuming the platform itself is overloaded.
Can I keep operating the machine after an 823 fault?
No. The controller disables lift up/down, telescope in/out, platform rotate, and platform level functions when this fault is active, so normal platform operation is not possible until it is resolved and the machine is power cycled.