E07
Lowara
DC Bus Overvoltage / Surge Protection Trip (Drive Models)
Pump display shows E07 and motor does not start, often after lightning or surges
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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
High mains voltage or transient surge, Incorrect supply (e.g. 400 V applied to 230 V unit), Regenerative overvoltage from rapid deceleration, Failed DC bus capacitor in Lowara drive
How to Fix / Troubleshooting
Safety first: Isolate power and wait several minutes for DC bus capacitors to discharge before opening the drive enclosure.
- Verify supply voltage: Measure line voltage and confirm it matches the Lowara drive rating. Correct any wiring errors or supply issues.
- Check braking/deceleration settings: If the pump is controlled by an external system, ensure it is not commanding extremely fast stop times that could cause regenerative overvoltage.
- Inspect for surge damage: Look for bulged or leaking capacitors, burn marks, or a burnt smell inside the drive. These indicate internal damage.
- Reset and monitor: After confirming supply is correct, reset the drive. If E07 recurs without obvious external cause, the DC bus components are likely damaged.
- When to call a pro: DC bus and capacitor replacement should be done by a qualified technician. In many cases, replacing the entire Lowara drive/control module is more economical.
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Repair Difficulty
Professional Required
5/5
Required Part
Lowara pool pump drive DC bus / capacitor assembly
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