When multiple Ground Fault Circuit Interrupter (GFCI) outlets trip simultaneously across different locations in a home, it typically points to a centralized electrical anomaly or an issue with the main branch circuit feeding them. Common causes include a major power surge from the utility provider that destabilizes sensitive electronic sensing circuits, severe moisture accumulation inside a main service panel or upstream junction box, or a shared neutral wire fault that creates a widespread current imbalance. Additionally, a malfunctioning primary master GFCI installed upstream can trigger a cascade effect if its internal differential current transformer becomes overly sensitive. You can troubleshoot widespread tripping safely by isolating main power. You can verify that your corrective action is successful when installing whole-home surge protection, clearing moisture, or replacing a faulty upstream master device restores stable, independent operation to every GFCI on the circuit.
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