E11
Pahlen
Overvoltage on DC Bus (Drive Fault)
Pahlén variable-speed pump displays E11 and stops when ramping up speed
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Sudden load shedding (valve closing) causing pressure spike, Incorrect braking parameters in drive, Supply voltage above specification, Internal drive fault
How to Fix / Troubleshooting
Safety first: Turn off power before adjusting plumbing or opening the drive enclosure.
- Check valves: Ensure no automatic valve is closing suddenly when the pump ramps up. Avoid rapidly closing return or bypass valves.
- Verify supply voltage: Have a qualified electrician confirm that the supply voltage is within the range specified by Pahlén for the drive.
- Adjust ramp settings: If accessible, reduce acceleration rate and maximum speed in the drive parameters to lessen electrical and hydraulic stress.
- Reset and test: Clear E11 and observe operation. If the error recurs without obvious hydraulic changes, the drive may have an internal fault.
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Repair Difficulty
Hard
4/5
Required Part
Variable-Speed Drive Module
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