Repeated protective-device tripping
Tell the contractor whether the same device has tripped more than once and what you observed immediately beforehand. Do not repeatedly reset protection that trips again. A safety switch (a device that detects current leakage) responds to current leakage, whereas a circuit breaker (a device protecting against excessive current) protects wiring and equipment against excessive current; some devices combine these functions. Understanding that difference helps you follow the electrician's explanation without treating a switch position as a diagnosis.