E29
Enel X
Pre‑Charge / Contactor Test Failure
Charger shows E29 and will not charge; app may indicate ‘contact welding test failed’ or ‘pre‑charge error’.
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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
Faulty pre‑charge resistor or circuit, Stuck contactor contacts, Incorrect voltage feedback to control board, Damaged sensing resistor
How to Fix / Troubleshooting
Safety: Pre‑charge circuits handle high voltage; only qualified technicians should service them.
- Step 1 – Power cycle: Turn OFF the breaker for several minutes, then turn it back ON and see if E29 clears.
- Step 2 – Listen for sequence: During start, you should hear a small click (pre‑charge) followed by a louder click (main contactor). Missing or abnormal sounds indicate a fault.
- Step 3 – Visual inspection: With power OFF, inspect the pre‑charge resistor and associated wiring on the power module for discoloration or cracking.
- Resolution: Replace the pre‑charge resistor assembly or main contactor as indicated by diagnostics. If components appear intact but E29 persists, replace the power module or main control board.
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Repair Difficulty
Professional Required
5/5
Required Part
Pre‑Charge Resistor Assembly / Main Contactor
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