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ASSMANNASSMANN

Troubleshooting of electrically adjustable desks

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  • The height of the desk can no longer be adjusted. What can I do?

    First, try initialisation – in other words, a reset of the control unit. 

    First, ensure that the desk is supplied with power and that all cables are properly connected. 

    1. Press and hold the down button on the manual switch until the desk has reached the lowest height. Release the down button. 
    2. Press and hold the down button again until the LED display reads “RST”. Release the down button. 
    3. Press and hold the down button again for several seconds until the desk lowers slightly and then raises slightly to a stop. Now release the down button. 
    4. The desk is now configured and ready for use. 

  • Where can I find the operating instructions for my desk?

    The relevant operating instructions for your STS desk can be downloaded from our media library.

    GO TO INSTRUCTIONS

  • Error code “C01”

    Description: Short circuit of motor 1.

    Troubleshooting steps:

    1. Unplug the desk from the power supply and resolve the external short circuit.
    2. Check the cables to the motor for damage.
    3. It may be necessary to replace the motor on the affected socket.
    4. Next, the control unit must be recommissioned.

  • Error code “C02”

    Description: Short circuit of motor 2.

    Troubleshooting steps:

    1. Unplug the desk from the power supply and resolve the external short circuit.
    2. Check the cables to the motor for damage.
    3. It may be necessary to replace the motor on the affected socket.
    4. Next, the control unit must be recommissioned.

  • Error code “C03”

    Description: Short circuit of motor 3.

    Troubleshooting steps:

    1. Unplug the desk from the power supply and resolve the external short circuit.
    2. Check the cables to the motor for damage.
    3. It may be necessary to replace the motor on the affected socket.
    4. Next, the control unit must be recommissioned.

  • Error code “C05”

    Description: The relay contact is stuck.

    Troubleshooting steps:

    1. The control unit must be replaced.
    2. Next, an Initialisation / Reset must be performed.

  • Error code “C11”

    Description: Cable disconnected from motor 1.

    Troubleshooting steps:

    1. Please check the cables and plug connections to the motors.
    2. Next, an Initialisation / Reset must be performed.

  • Error code “C12”

    Description: Cable disconnected from motor 2.

    Troubleshooting steps:

    1. Please check the cables and plug connections to the motors.
    2. Next, an Initialisation / Reset must be performed.

  • Error code “C13”

    Description: Cable disconnected from motor 3.

    Troubleshooting steps:

    1. Please check the cables and plug connections to the motors.
    2. Next, an Initialisation / Reset must be performed.

  • Error code “C15”

    Description: No pulses detected on motor 1.

    Troubleshooting steps:

    1. Please check the cables to the motor for damage and secure contact.
    2. It may be necessary to replace the motor on the affected socket.
    3. The control unit must now be recommissioned.
    4. Next, an Initialisation / Reset must be performed.

  • Error code “C16”

    Description: No pulses detected on motor 2.

    Troubleshooting steps:

    1. Please check the cables to the motor for damage and secure contact.
    2. It may be necessary to replace the motor on the affected socket.
    3. The control unit must now be recommissioned.
    4. Next, an Initialisation / Reset must be performed.

  • Error code “C17”

    Description: No pulses detected on motor 3.

    Troubleshooting steps:

    1. Please check the cables to the motor for damage and secure contact.
    2. It may be necessary to replace the motor on the affected socket.
    3. The control unit must now be recommissioned.
    4. Next, an Initialisation / Reset must be performed.

  • Error code “C18”

    Description: Motors no longer synchronised, due to exceeding the maximum load.

    Troubleshooting steps: Please remove the load from your desk.

  • Error code “C34”

    Description: Excess current on motor 1.

    Troubleshooting steps: The maximum load has been exceeded. Please remove the load from your desk.

  • Error code “C35”

    Description: Excess current on motor 2.

    Troubleshooting steps: The maximum load has been exceeded. Please remove the load from your desk.

  • Error code “C36”

    Description: Excess current on motor 3.

    Troubleshooting steps: The maximum load has been exceeded. Please remove the load from your desk.

  • Error code “C37”

    Description:  The total current in the motor is too high.

    Troubleshooting steps: The maximum load has been exceeded. Please remove the load from your desk.

  • Error code “C38”

    Description: Motors are no longer synchronised.

    Troubleshooting steps:

    1. The motor positions are too different. Please distribute the load evenly across the desk.
    2. If necessary, reduce the load on the desk.
    3. Next, an Initialisation / Reset must be performed.

  • Error code “C39”

    Description: Cascade error – a control unit is not communicating.

    Troubleshooting steps:

    1. Check that the STAND.CONNECT cable is correctly connected between the control units.
    2. Check that both control units have a power cable connected to them.
    3. Restore the factory settings via the F3 menu to perform a reconfiguration.
    4. Next, an Initialisation / Reset must be performed.

  • Error code “C40”

    Description: Sensor module error.

    Note: Any further manoeuvres will be performed without collision protection, but remain possible.

    Troubleshooting steps: Check the sensor module.

  • Error code “C41”

    Description: Internal sensor defective.

    Troubleshooting steps: The control unit must be replaced.

  • Error code “C51”

    Description: Conflicting movement commands.

    Troubleshooting steps: Please stop operation of all available manual switches.

  • Error code “C52”

    Description: A button is jammed on the manual switch.

    Troubleshooting steps: The manual switch must be replaced.

  • Error code “C53”

    Description: A button is jammed on the manual switch.

    Troubleshooting steps: The manual switch must be replaced.

  • Error code “C81”

    Description: Voltage too low.

    Troubleshooting steps:  If the voltage is too low, there are multiple possible reasons for this. Too-low voltage can occur after disconnecting the power cable, or can be caused by a defective power supply unit.

    1. The control unit must be replaced.
    2. Next, an Initialisation / Reset must be performed.

  • Error code “C82”

    Description: Voltage too high. The power supply unit is defective.

    Troubleshooting steps:

    1. The control unit must be replaced.
    2. Next, an Initialisation / Reset must be performed.

  • Error code “C84”

    Description: No columns connected when switching on the control unit.

    Troubleshooting steps:

    1. First, connect the desired number of columns and manual switches.
    2. Restore the factory settings via the F3 menu.
    3. Next, an Initialisation / Reset must be performed.

  • Error code “C85”

    Description: The number of columns does not match the current configuration.

    Troubleshooting steps:

    1. Please check the motor cables.
    2. Restore the factory settings via the F3 menu.
    3. Next, an Initialisation / Reset must be performed.

  • Error code “rEF”

    Description: An initialisation manoeuvre is performed.

    Troubleshooting steps: Please perform the initialisation manoeuvre to the lowest block position.

  • Error code “SP”

    Description: A protective mechanism or system delay has been triggered by exceeding the maximum operating time of the system.

    Troubleshooting steps: Wait until the control unit has cooled down and “SP” disappears from the display. Then, the desk can be operated for 17 seconds at a time. The desk can only be operated for a full 2 minutes after 18 minutes have passed.

    Note: The operating time is limited, even when disconnected from the power supply.

  • Error code “COL”

    Description: Collision (unidentified) detected.

    Troubleshooting steps: Please remove the obstacle.

  • Error code “SCC”

    Description: Hall signal collision detected.

    Troubleshooting steps: Please remove the obstacle.

  • Error code “SEn”

    Description: Sensor collision detected.

    Troubleshooting steps: Please remove the obstacle.

  • Error code “CAL”

    Description: Sensor is calibrating.

    Troubleshooting steps: Please refrain from pressing any buttons and allow the sensor to calibrate.

  • Error code “PAr”

    Description: Parameter error.

    Troubleshooting steps:

    1. Restore the factory settings via the F3 menu.
    2. If this does not solve the problem, the control unit must be replaced, or a valid set of parameters imported via CON.STAND.

  • Incorrect height setting displayed, e.g. “64” at height “62”

    Description: Incorrect display value.

    Note:
    Please check whether rolling under-desk cabinets or other solid objects under the desk are blocking the desk from reaching the lower end point. The desk features collision protection as standard, which automatically stops the desk and causes it to move in the opposite direction when it encounters an obstacle. This stop can mistakenly be interpreted as the desk having reached the end point. In this case, initialisation does not take place. Instead, the process must be repeated from the start.

    Troubleshooting steps:

    1. Please press the DOWN▼ button until this is shown on the display.
    2. Then press the M button until the height indicator flashes on the display.
    3. The height indicator can be corrected on the display using the UP▲ and DOWN▼ buttons.
    4. After a few seconds, the height indicator stops flashing.
    5. The desk can now be initialised by pressing the DOWN▼ button for approx. 5 seconds, until the desk has moved slightly down and up again.
    6. Only release the DOWN▼ button once the desk has stopped moving.
    7. Now, the desk is initialised and the height can be individually adjusted.

    Note:
    If, while moving the desk to the reference position, the operating buttons are released before the process is completed, the reference manoeuvre will be cancelled and the entire Initialisation process must be repeated.

  • Display blank | Desk not moving

    Description: The UP▲ and DOWN▼ buttons are not working. The manual switch may not be plugged in correctly.

    Troubleshooting steps:

    1. Please check the plug connection.
    2. If the plug connection is correct, the manual switch may be defective. If necessary, you can perform a cross-check using a different manual switch, if you have one available (e.g. from another operational desk).
    3. If the problem persists, it is also possible that the control unit is defective. If necessary, perform a cross check (if possible with simple tools).

  • Error code “H01” | Desk not moving

    Description:  The maximum operation time of 2 minutes has elapsed or a temperature sensor has been triggered in the control unit.

    Troubleshooting steps:

    1. Please refrain from pressing any buttons and leave the desk and control unit connected to the power supply!

    Note: If another button is pressed immediately, the error code “H01” will reappear on the display and the desk will not move.

    1. After a rest time of approx. 3 minutes, approx. 20 seconds of operation time will once again become available. After a rest time of approx. 18 minutes, the desk can be operated for approx. 2 minutes.
    2. Once the necessary rest time has elapsed, the error code “H01” will disappear and the display will show the current height adjustment.

    Note: The control unit calculates and saves the necessary rest times, even when disconnected from the power supply. This protective mechanism prevents overheating and damage to the motors.

  • Error code “E01” or “E02” | Desk not moving, or only partially

    Description: Excess current on motor 1 or motor 2. This error usually occurs during the UP▲ operation of the desk.

    Troubleshooting steps:

    1. There may be too much load on the desk or on part of the desk frame. Please reduce the weight on the desk.
    2. The error can also be caused by mechanical damage, such as a dent in the guide tubes of the lifting column or the side pieces.
      Note: In the event of mechanical damage, the error usually occurs in the same position or at the same height on the desk frame. The damaged components (side pieces/lifting column) may need to be replaced.
    3. Next, an Initialisation / Reset must be performed.

  • Error code “E07” or “E08” | Desk not moving

    Description: Motor 1 or motor 2 not correctly connected.

    Troubleshooting steps:

    1. Please check the cables and plug connections to the motors, and plug them in correctly, if needed.
    2. Please check the cables for damage. If the cable is damaged, the cable must be replaced and the desk, recommissioned.
    3. Next, the desk must be initialised.
    4. To perform the initialisation, please press the DOWN▼ button until this is shown on the display.
    5. Next, press the button again until the desk moves at half speed into the initialisation position, at the lowest end point of the desk. While doing so, hold the DOWN▼ button until all the drives have reached the lowest position. Only release the DOWN▼ button once the desk has stopped moving.
      Note:
      Please check whether rolling under-desk cabinets or other solid objects under the desk are blocking the desk from reaching the lower end point. The desk features collision protection as standard, which automatically stops the desk and causes it to move in the opposite direction when it encounters an obstacle. This stop can mistakenly be interpreted as the desk having reached the end point. In this case, initialisation does not take place. Instead, the process must be repeated from the start.
    6. The desk can now be initialised by pressing the DOWN▼ button for approx. 5 seconds, until the desk has moved slightly down and up again. Only release the DOWN▼ button once the desk has stopped moving.
      Note:
      If, while moving the desk to the reference position, the operating buttons are released before the process is completed, the reference manoeuvre will be cancelled and the entire Initialisation process must be repeated.
    7. Now, the desk is initialised and the height can be individually adjusted.

  • Error code “E13” | Desk not moving

    Description: The control unit is defective.

    Troubleshooting steps:

    1. The control unit must be replaced.
    2. Next, perform an Initialisation / Reset, if necessary.

  • Error code “LOC” | Control panel not operational

    Description: The control panel is no longer operational as it has been accidentally locked.

    Troubleshooting steps:

    1. Hold the M button for approx. 15 seconds until the current height is shown on the display.
    2. The desk is unlocked.

    To lock/unlock the desk, press the M button again for 15 seconds until “LOC” appears on the display.

  • Initialisation / Performing a reset

    First, ensure that the desk is supplied with power and that all cables are properly connected. 

    1. Press and hold the down button on the manual switch until the desk has reached the lowest height. Release the down button. 
    2. Press and hold the down button again until the LED display reads “RST”. Release the down button. 
    3. Press and hold the down button again for several seconds until the desk lowers slightly and then raises slightly to a stop. Now release the down button. 
    4. The desk is now configured and ready for use. 

  • Is your height-adjustable desk still not working?

    Then contact our customer service. Together, we will find the solution to making your sit-stand desk operational again.

    GO TO CUSTOMER SERVICE