JLG Telescopic Boom Lift 11 Fault Code: Sleep Mode
Also called All Systems OK, Charge Air Temperature, FSW Open, Help Comment - FSW Open, Low Oil Pressure, Low Oil Pressure - Below 7psi
Sleep Mode · ai-assisted, editor-reviewed · Last updated 2026-07-13
TL;DR
Fault code 11 on JLG telescopic boom lifts covers several different conditions depending on the specific fault entry: an open platform foot switch (FSW), a sensor circuit fault (SPN 174 / FMI 2), low oil pressure, or a sleep mode indication (flash code 1-1). The most common trigger operators see is a drive or boom function selected while the platform foot switch is not depressed.
Medium severity. On its own, an open foot switch fault is a normal safety interlock response and not damaging. But if it appears alongside a sensor fault or low oil pressure reading, treat it as higher priority since continued operation with a bad sensor or low oil pressure can risk component damage.
What does JLG Telescopic Boom Lift error code 11 mean?
Fault code 11 is used across several JLG telescopic boom lift fault entries, so what it means depends on which description your machine display shows. The most frequent version is 'FSW Open,' meaning the operator selected a drive or boom function without first depressing the platform foot switch. This is a safety interlock doing its job: JLG telescopic booms require the operator to hold the foot switch down before any drive or boom function will respond.
A second version relates to a sensor fault, identified as SPN 174 / FMI 2 in the sensor fault group. This indicates a fault at a corresponding sensor entry, such as a short circuit or a broken cable in that sensor's wiring. When a sensor fails this way, the associated monitoring function tied to that sensor is deactivated until the fault is cleared.
A third version points to low oil pressure, including a specific low oil pressure condition below 7 psi. A fourth version, flash code 1-1, simply indicates the machine has entered sleep mode and needs no action.
Common causes of 11
- Operator selected a drive or boom function without depressing the platform foot switch [XI52] first
- Short circuit or cable break at a sensor associated with the monitoring system (SPN 174 / FMI 2)
- Low engine or hydraulic oil pressure, including a specific threshold below 7 psi
- Machine sitting idle and entering sleep mode, shown as flash code 1-1, which requires no corrective action
How to troubleshoot JLG Telescopic Boom Lift 11: first checks
- Confirm the operator is fully depressing the platform foot switch before attempting any drive or boom function
- Inspect the foot switch [XI52] itself and its wiring for damage, corrosion, or a stuck/faulty switch
- Check the sensor cable associated with the fault for visible damage or a break in continuity
- Check the sensor itself and replace it if it fails inspection or testing
- Check oil level and inspect oil supply lines for leaks, kinks, or restrictions
- Verify correct operation of the oil pressure switch using a test gauge rather than relying on the dash indication alone
How the code clears
No separate clearing step is listed for the foot switch version: once the foot switch is depressed correctly, the fault should clear on its own as normal operation resumes. For the sensor fault version, correcting the cable or sensor issue and checking the fault limits for that sensor is the listed remedy. For low oil pressure, correcting the oil level or supply line issue and confirming with a test gauge is the listed path. The sleep mode flash code 1-1 requires no action at all.
Affected models and serial ranges
11 appears in our records across 1 JLG Telescopic Boom Lift models. Match your machine by model and serial number.
| Model | Serial ranges |
|---|---|
| E600 | Serial range not listed in source records |
Frequently asked questions
What does fault code 11 mean on a JLG boom lift?
It depends on which specific fault text your machine shows. It could mean the platform foot switch is open (not being pressed) when a drive or boom function was selected, a sensor circuit problem, low oil pressure, or simply that the machine is in sleep mode (flash code 1-1).
Why does my JLG boom lift say the foot switch is open?
This means a drive or boom function was selected in the platform without the operator fully depressing the foot switch first. This is a safety feature so the machine will not move unless the operator's presence is confirmed on the foot switch.
Is fault code 11 dangerous to keep operating with?
The foot switch open condition by itself is a normal safety response, not a malfunction. However, if the code is tied to a sensor fault or low oil pressure, continuing to operate could risk equipment damage or loss of a monitoring function, so those versions should be checked before continued use.
What is flash code 1-1 on a JLG lift?
Flash code 1-1 indicates the machine is in sleep mode. No action is required for this condition.
How do I fix low oil pressure related to code 11?
Check the oil level and inspect oil supply lines for leaks or blockages, then verify actual pressure with a test gauge on the oil pressure switch rather than trusting the warning alone. The listed low pressure threshold is below 7 psi.
How do I troubleshoot a sensor version of fault code 11?
Check the sensor cable for a short circuit or break, check the sensor itself and replace it if needed, and check the fault limits programmed for that sensor. Note that while the sensor is faulted, its associated monitoring function is deactivated.
Does fault code 11 clear itself?
For the foot switch version, yes: once the foot switch is properly depressed, the condition should clear as normal operation resumes. No separate clearing step is listed for the other versions beyond correcting the underlying cause.