Performed diagnostic troubleshooting on a timer controlling an outlet for a pool pump. The circuit breaker was tripping instantly, indicating a direct short in the system. Upon inspection, I identified that the recently installed timer had been incorrectly wired. The issue stemmed from a jumper wire mistakenly run from the neutral terminal to the NO1 (Normally Open) terminal—likely due to a misinterpretation of the "N" terminal as "Neutral" rather than recognizing it as part of the timer's control logic. Previous installer believed there was 2 line side neutral terminal's. This incorrect wiring caused a direct short when the timer activated. I corrected the issue by removing the neutral jumper and properly wiring the black load wire from the outlet to the NO1 terminal. The circuit was tested and confirmed to be operating safely and as intended.