The quick answer
Protect equipment and water first. Turn off power for leaks, burning smell, unusual heat or electrical damage, then check simple conditions safely.
Identify what stopped means
A silent motor, humming motor, running motor with no flow and a pump losing prime have different causes. Note what changed.
Perform safe visual checks
Confirm normal water level, clear accessible baskets and look for closed valves or leaks. Never open energized equipment.
Check power cautiously
A breaker or automation fault may stop the pump. Repeatedly resetting a tripping breaker is not a repair.
Avoid dry operation
A pump running without water can overheat and damage components. Shut it down if it cannot establish normal prime.
Protect water quality
Warm water can deteriorate quickly without circulation. Get qualified help and keep swimmers out if sanitation or visibility is uncertain.