Why does my pool pump run in the winter when not scheduled to run?

Your pool pump may run in the winter due to a timer malfunction, a stuck relay, or a programming error in the pool automation system. Additionally, some systems are set to run periodically to prevent freezing and maintain water circulation. It’s also possible that the pump is inadvertently activated by a sensor or a manual override. Checking the timer settings and the system's electrical components can help identify the cause.