Kia home charger shows E03 and does not energize the relay; charging does not start.

Safety first: The main contactor switches high current. Do not attempt to manually force or file contacts. Always isolate power at the breaker before opening the charger.

• 1. Power reset: Turn off the EV charger breaker for 5 minutes, then turn it back on and reconnect the vehicle. If E03 clears temporarily but returns, the contactor is likely failing mechanically.
• 2. Listen for relay click: When you plug in the vehicle and charging should start, listen closely at the charger. A healthy unit will make a distinct click as the contactor engages. No click or a buzzing sound suggests a coil or driver issue.
• 3. Check for overheating signs: With the cover on, feel the front of the charger (after power off and cool-down) for localized heat marks or discoloration. Burnt smell or yellowed plastic near the top often indicates contactor overheating.
• 4. Internal inspection (technician): With power off and cover removed, a technician can visually inspect the main contactor for discoloration, melted housing, or carbon deposits. They can also measure coil resistance and verify that the control board is sending the correct voltage to the coil.
• 5. Replace the contactor assembly: If the contactor is welded or the coil is open, it must be replaced with the Kia-specified EVSE contactor model. Reuse of generic contactors is not recommended due to safety and certification requirements.

Because this fault involves high-voltage switching components, contact a qualified EVSE service provider or electrician for repair.