Responded to emergency call in Denver regarding non-functional sump pump during heavy rainfall. Upon inspection, determined the Zoeller M63 1/3 HP pump had failed due to seized impeller and worn bearings. Water level in pit was approaching basement floor level requiring immediate action. Replaced pump with equivalent model and installed new check valve as previous valve was showing signs of deterioration. Also identified improper float switch height adjustment which had caused short-cycling. Corrected positioning to ensure proper activation/deactivation cycles. Discharge line was partially obstructed with mineral buildup; cleared using mechanical snake to ensure maximum flow capacity. Verified proper operation through multiple test cycles confirming appropriate water level triggering. Additionally, installed water alarm system at customer's request to provide early warning of pump failure. System is now functioning correctly with water level maintaining appropriately low level in pit.