E04
Lowara
Phase Loss / Phase Failure (Three‑Phase Models)
Display shows E04 and pump will not start, sometimes after a power outage
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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
Blown fuse on one phase, Loose phase conductor in control panel, Faulty contactor feeding the Lowara pump, Internal drive phase detection fault
How to Fix / Troubleshooting
Safety first: Only qualified persons should work inside three‑phase panels. Isolate and lock out the supply.
- Check upstream protection: Inspect fuses or breakers feeding each phase to the pump. Replace any blown fuses with the correct rating specified for the Lowara unit.
- Inspect terminals: Tighten L1, L2, and L3 terminals at the pump starter, contactor, and drive input. Look for burnt or discolored wires.
- Measure phase voltages: With power ON (by a qualified person), measure L1–L2, L2–L3, and L3–L1. All should be within a few volts of each other and match the nameplate.
- Reset the drive: After correcting any supply issues, reset the Lowara drive or power-cycle for several minutes.
- When to call a pro: If all three phases are present and balanced but E04 persists, the internal phase detection circuit in the drive may be defective and the drive/control module will likely need replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Lowara pool pump drive/control module
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