Haulotte Optimum 8 (Optimum 1931 E): electric scissor lift, newer generation
Haulotte error code F08.04 — Supply
Message on the display: Supply
Code F08.04 occurs in machines: Haulotte OPTIMUM 8, OPTIMUM 1931 E.
blocking fault
[case 1] COMBIACX: Power capacitors voltage does not increase at start-up. [case 2] COMBIACX: The controller detects an overvoltage or undervoltage condition. Overvoltage threshold is 35 V, under voltage threshold is 9.5 V. If the fault appears at start-up or during standby : Check that no external device (relays switching, solenoids energizing/de-energizing... ) is connected to the batteries, creating down- going pulses. If no voltage transient is detected on the supply line and the alarm appears every time the key is switched ON : Replace the controller. [case 4] COMBIACX: At start-up, the battery voltage is too low or too high (< 0,8 Vbatt or >1,2 Vbatt). If it does not match, then do a ADJUST BATTERY function. If the default still appears, replace the battery. [case 8] COMBIACX: A low logic level of Key-Off has been detected during start-up diagnosis. If no voltage transient is detected on the supply line and the alarm appears every time the key is switched ON : Replace the controller. [case 16] ACEX: Power capacitors voltage does not increase at start-up. [case 32] ACEX: The controller detects an overvoltage or undervoltage condition. Overvoltage threshold is 35 V, under voltage threshold is 9.5 V. If the fault appears at start-up or during standby : Check that no external device (relays switching, solenoids energizing/de-energizing... ) is connected to the batteries, creating down- going pulses. If no voltage transient is detected on the supply line and the alarm appears every time the key is switched ON : Replace the controller.
Description from the Haulotte service manual, in the original wording.
Possible causes
- Ensure that no external device is connected to the batteries.
- Check battery, power cables and connections.
- Check if the fault appears during driving acceleration (under voltage condition detected) :
- Check battery charge ; check for damaged batteries, battery cables and connections.
- Check if the fault appears during release braking (overvoltage condition detected) : Check line contactor contact, battery power cable connection.
- Check that the controller SET BATTERY parameter value matches the battery nominal voltage (24VDC).
- Check that the TESTER MENU / BATTERY VOLTAGE parameter shows same value as the battery voltage measured with a voltmeter.
- Check that no external device (relays switching, solenoids energizing/de,energizing...) is connected to the batteries, creating downgoing pulses.
- Check the connection of power cabled to the battery terminal, positive and negative, to MC DRIVE and to +Batt and -Batt, which must be screwed with a torque comprised in the range 5,6 Nm - 8,4 Nm.
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.
Solution from the manual
Ensure that no external device is connected to the batteries. Check battery, power cables and connections. Check if the fault appears during driving acceleration (under voltage condition detected) : Check battery charge ; check for damaged batteries, battery cables and connections. Check if the fault appears during release braking (overvoltage condition detected) : Check line contactor contact, battery power cable connection. Check that the controller SET BATTERY parameter value matches the battery nominal voltage (24VDC). Check that the TESTER MENU / BATTERY VOLTAGE parameter shows same value as the battery voltage measured with a voltmeter. Check that no external device (relays switching, solenoids energizing/de,energizing...) is connected to the batteries, creating downgoing pulses. Check the connection of power cabled to the battery terminal, positive and negative, to MC DRIVE and to +Batt and -Batt, which must be screwed with a torque comprised in the range 5,6 Nm - 8,4 Nm. Ensure that no external device is connected to the batteries. Check battery, power cables and connections. Check if the fault appears during driving acceleration (under voltage condition detected) : Check battery charge ; check for damaged batteries, battery cables and connections. Check if the fault appears during release braking (overvoltage condition detected) : Check line contactor contact, battery power cable connection.
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 F08.04 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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