UniMac Industrial Washer Error Code Drive Balance Switch Error
Drive Balance Switch Error means the UniLinc control saw the VFD balance switch input closed at the start of a Drain step. The cycle is aborted with the Cycle Aborted Error Menu and an audio alarm. Clear the menu and return to the Cycle Menu.
Medium: the cycle is aborted before spin, and a better-balanced load may cure it.
- Code
- Drive Balance Switch Error
- Maker
- UniMac
- Equipment
- Industrial laundry
- Applies to
- UniLinc control pocket hardmount washer-extractor (UW35-UW150, 2009-2012 manuals)
What does UniMac Drive Balance Switch Error mean?
Before the machine spins up after a drain, the control checks the balance switch that the drive reports through the VFD. At the start of a Drain step, that input should be open. If the control finds it closed, it aborts the cycle, shows the Cycle Aborted Error Menu with Drive Balance Switch Error, sounds the audio alarm and logs the event. The manual's instruction is just to clear the menu and return to the Cycle Menu. The check exists to stop the machine from spinning a load that the drive already considers out of balance, or a switch that is stuck. Common explanations are a load that sits unevenly, a switch that is stuck or damaged, or a wiring problem on the input. A balance condition on the frame is reported separately, as Frame Balance Switch Error.
Affected models and control systems
UniMac UniLinc control on the UW35TV, UW60TV, UW80TV, UW100TV, UW125TV and UW150TV washer-extractors and the UWL, UWN and UWU 035-150 T3 models.
Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.
What you may notice
- Drive Balance Switch Error on the display
- Audio alarm
- Cycle aborted at the start of the drain
- Heavy or lopsided load inside the tub
Possible causes
Likely causes — what usually sits behind Drive Balance Switch Error on this control. A technician confirms which one it is before any part is replaced.
- Load unevenly distributed in the tub
- Drive balance switch stuck closed
- Wiring to the balance switch input damaged
- Drive reporting an out-of-balance state it should have cleared
Safe checks before calling for service
- Clear the Cycle Aborted Error Menu and return to the Cycle Menu.
- Open the door when it unlocks and redistribute the load.
- Run a lighter load to see whether the error returns.
- Do not keep repeating the cycle with the same load.
- If it repeats with small loads, tell the technician what the load size was.
How a technician diagnoses Drive Balance Switch Error
- Read the event log for the cycle and step.
- Check the balance switch state with the tub empty.
- Test the switch and its wiring.
- Check the drive's reporting of the balance condition.
- Replace the failing switch or repair the wiring, then run a test cycle.
- The drive and its switch circuit carry line-level and high-frequency power.
- A spinning drum can cause serious injury if guards are removed.
- Testing a drive input needs a meter and the maker's service information.
How Drive Balance Switch Error differs from similar codes
Drive Balance Switch Error comes from the VFD balance switch. Frame Balance Switch Error comes from the frame.
Technical reference
- Maker documentation
- UniMac owner support
- Edition
- Part No. F8138801R3, September 2009
- Models / control
- UniLinc control pocket hardmount washer-extractor (UW35-UW150, 2009-2012 manuals)
- Section
- Diagnostic: Machine Errors (pp. 56-59)
- Checked
- October 2026
We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.
Related UniMac industrial laundry error codes
Is this an overloaded machine?
It can be an uneven load. A lighter, evenly spread load is the first test.
Can I resume the cycle?
No. The manual lists clearing the menu as the action.
What is the VFD?
It is the variable frequency drive that runs the drum motor.
Need help with UniMac Drive Balance Switch Error?
A technician confirms the cause on site and gives you the price in writing before any work starts.