E17
Rolec Phase Loss / Phase Imbalance Fault

Charger displays E17; app may show "phase imbalance" or "phase loss" on three‑phase Rolec units.

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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 or MCB on one phase, Loose phase conductor at charger terminal block, Faulty three‑phase contactor pole, Phase monitoring circuit failure on control PCB

How to Fix / Troubleshooting

Safety first: Three‑phase systems carry high fault energy. Only qualified electricians should work on them.

  • Check upstream protection: Inspect the three‑phase MCBs or fuses feeding the charger. Replace any blown fuses and investigate the cause.
  • Inspect terminations: With power isolated, verify that L1, L2, and L3 conductors are correctly landed and tightly secured in the charger’s terminal block and contactor.
  • Test voltages (electrician only): Measure L1‑L2, L2‑L3, and L3‑L1 voltages at the charger to confirm all phases are present and balanced.
  • Check contactor poles: If one pole is burnt or not making contact, replace the three‑phase contactor with a Rolec‑approved equivalent.
  • PCB phase monitor fault: If all phases are healthy but E17 persists, the phase monitoring circuit on the control PCB may be defective and require replacement.
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Repair Difficulty

Professional Required 5/5

Required Part

Three‑phase main contactor
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