E07

Zaptec Main Contactor Failure

Charger shows E07; app indicates ‘Contactor fault / welded or open’ and unit will not charge

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.

Possible Causes

Welded contactor contacts, Open coil or mechanical jam in contactor, Loose control wiring to contactor, Faulty contactor driver on main board

How to Fix / Troubleshooting

Safety first: A welded contactor can leave the output live even when the charger reports off. Only qualified personnel should open the unit.

User-level checks:

Turn off the charger’s breaker and do not use the unit until inspected.
Inform all household members not to plug in a vehicle until the fault is resolved.

Technician steps:

With power off, open the charger and visually inspect the main contactor for heat damage or discoloration.
Check coil resistance and mechanical movement of the contactor.
Verify control voltage from the main board during a start command.
Replace the main contactor if welded or mechanically defective. If the contactor is good but not driven correctly, replace or repair the main control board.

Repair Difficulty

Professional Required 5/5

Required Part

Main Contactor

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