E15
EO Charging
Contactor Coil / Driver Circuit Fault
EO charger displays E15; app may indicate contactor coil or driver fault.
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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
Open or shorted contactor coil, Failed contactor driver transistor on PCB, Loose coil wiring, Incorrect coil voltage contactor fitted
How to Fix / Troubleshooting
Safety first: Isolate power and verify absence of voltage before working inside the charger.
- Visual inspection: Locate the main contactor and inspect the coil terminals and wiring for looseness or damage.
- Measure coil resistance: With the charger isolated, disconnect one coil lead and measure resistance across the coil. An open circuit or extremely low resistance indicates a faulty coil; replace the contactor with the EO‑specified part.
- Check coil voltage rating: Confirm that the installed contactor coil voltage matches the EO design (e.g., 230 V AC or 24 V DC). An incorrect replacement can cause E15.
- Inspect PCB driver: Look for burn marks or damaged components in the area of the contactor driver on the main PCB. If present, the PCB will likely need replacement.
- Reassemble and test: After replacing the contactor or PCB, reassemble the unit, restore power, and initiate a test charge to confirm that E15 is cleared.
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Repair Difficulty
Hard
4/5
Required Part
Main power contactor
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