E04
AquaJet
Phase Loss / Phase Imbalance (for 3‑phase AquaJet models)
Display shows E04 and pump will not start; sometimes occurs 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
One phase not connected at terminal block, Tripped breaker on one leg, Loose or burned contact in external contactor
How to Fix / Troubleshooting
Safety first: This involves 3‑phase power. Only qualified persons with proper PPE should work inside the electrical panel.
- Verify all phases present: With a multimeter, measure voltage between L1‑L2, L2‑L3, and L1‑L3 at the AquaJet pump terminals. All should be within the specified range and balanced.
- Inspect breakers and contactor: Check that all 3‑pole breakers feeding the pump are ON and not tripped. Inspect the external contactor (if used) for burned or pitted contacts.
- Tighten terminals: With power off, tighten all phase conductors at the pump terminal block and in the control panel.
- Reset the drive: After restoring proper 3‑phase supply, power cycle the AquaJet pump and clear the E04 code according to the user manual (usually by pressing and holding STOP/RESET).
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Repair Difficulty
Hard
4/5
Required Part
Power Terminal Block
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