Generator shuts down under load, E06 displayed on controller

Safety first: Place the generator in OFF mode, open the main output breaker on the generator, and isolate the ATS. Do not work on live circuits unless you are a qualified electrician.

• Reduce load: Disconnect non-essential loads from the building circuits. Confirm that the total connected load does not exceed the Hyundai standby generator's rated output (see nameplate).
• Inspect main breaker: Check the Hyundai main output circuit breaker for signs of overheating or mechanical damage. Reset it fully OFF then ON. If it trips immediately with no load, the breaker may be faulty.
• Check for wiring faults: Have a qualified electrician inspect the ATS wiring, load panel, and any recent electrical work for shorts, ground faults, or miswired phases that could cause overcurrent.
• Test with minimal load: Start the generator in manual mode with the main breaker OFF. If it runs without E06, gradually apply load and monitor current. If E06 appears at low load, suspect a faulty current transformer (CT) or controller input.
• Replace defective components: Replace the main circuit breaker or CTs with Hyundai-approved parts if testing confirms they are faulty.