Why is it harder to troubleshoot timer failures in solid state timer systems compared to motor driven timers?

The difficulty in troubleshooting timer failures in solid-state timer systems stems from the fact that the operation of these timers is not visible. Unlike motor-driven timers, which often have moving parts that can be observed during their operation, solid-state timers rely on electronic components and circuits that do not present any physical movement or obvious signs of operation. This lack of visual indicators makes it challenging for a technician to determine if the timer is functioning correctly or identify any potential issues. The absence of moving parts means that traditional troubleshooting techniques, which often rely on observation of motion or sound, are not applicable here. Consequently, a solid-state timer demands more in-depth diagnostic methods, such as the use of multimeters or oscilloscopes, to assess its functionality, as the failure modes are not as immediately apparent.