Haulotte Optimum 8 (Optimum 1931 E): electric scissor lift, newer generation
Haulotte error code F12.09 — ECU fault (slave)
Message on the display: ECU fault (slave)
Code F12.09 occurs in machines: Haulotte OPTIMUM 8, OPTIMUM 1931 E.
blocking fault
[case 1] ACEX: Software watchdog active. Key OFF/ON. [case 2] ACEX: Problem on the Analog/Digitial conversion of micro controller. Key OFF/ON. [case 4] ACEX: Watchdog circuit output became high due to hardware or software problem (WDG1). Alarm caused by a hardware failure in one of two (or both) controllers or due to a software execution problem. Type of default not related to external components. Cycle power to clear the fault. If the fault is not cleared, replace the controller. [case 8] ACEX: Watchdog circuit output became high due to hardware or software problem (WDG2). Alarm caused by a hardware failure in one of two (or both) controllers or due to a software execution problem. Type of default not related to external components. Cycle power to clear the fault. If the fault is not cleared, replace the controller. [case 16] ACEX: Current gain acquisition has not been performed or EEPROM damaged. Key OFF/ON. If fault persists, a new current gain acquisition has to be performed. [case 32] ACEX: Wrong client software. Load the software to COMBIACX and ACEX controllers. [case 64] ACEX: RAM checksum failed. Internal failure. [case 128] ACEX: Timeout of client function (execution time exceed maximum allowable time). Key OFF/ON.
Description from the Haulotte service manual, in the original wording.
Possible causes
- Replace the controller.
What you can do
Switch the machine off with the emergency stop and switch it on again. If the code comes back, do not use the machine and call service.
What service does
A qualified service technician reads the code with the manufacturer's diagnostic tools, finds the cause, clears the code and carries out a function test.
Source: Haulotte Maintenance Book Optimum 8 (4001069810), fault codes chapter.
The descriptions are quoted from the manufacturer's service documentation and are for guidance only. Clearing codes, calibrations and repairs are carried out by a qualified service technician according to the manual for the specific serial number. A machine with an active blocking code must not be used until the cause has been removed.
Does code F12.09 not go away?
RK Rental services Haulotte lifts at our workshop or on site at the customer's premises (construction site, factory, warehouse). We read the code, remove the cause and select the parts by serial number.
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