Diagnosis
The control system lost its power reference. This happens after a long power disconnection or a voltage spike. The desk needs a full recalibration.
How to Fix It
Lower the desk completely until it stops. Press and hold the 'Down' button on the handset for 5 seconds until you hear a long beep. The desk will now rise to its maximum height and stop. Your memory presets are cleared. Set new positions by moving to your desired height and holding the 'M' button, then the number (1, 2, or 3).
If That Didn't Work
The handset cable connection at the control box may be loose. Unplug the desk, check the small rectangular connector from the handset is fully seated into the control box, then plug power back in and recalibrate.
Heads Up
Always recalibrate after moving the desk or experiencing a power outage. An uncalibrated desk can drive itself into the floor or top out early.