How do you diagnose evaporative cooler problems?

To diagnose evaporative cooler problems, start by checking whether the unit is receiving power and ensure that the circuit breaker or fuse is functioning. Inspect the water supply for blockages or leaks, and ensure the water pump is operational. Additionally, examine the pads for cleanliness and proper saturation, as dirty or dry pads can hinder performance. Finally, listen for unusual noises from the motor or fan, which may indicate mechanical issues.