Pool Pump Not Working: Humming, Loud, Losing Prime, or Dead

Updated 2026-11-05 · For Las Vegas pool owners

The pump is the one piece of pool equipment that cannot take a day off in Las Vegas. When it stops, chlorine disappears in the heat and the pool starts turning within two or three days in summer. The symptom usually points to the cause, and the cheap fixes are more common than people expect. Here is how to sort out what you are hearing before a technician arrives.

What it usually means

Hums for a few seconds, then clicks off: most often a failed start capacitor. The motor has power but cannot get spinning. Sometimes the impeller is jammed with debris. This is the cheapest repair on the list.
Loud grinding or screaming: motor bearings. Las Vegas heat and dust shorten bearing life, and a bearing that squeals in the morning will seize within weeks.
Runs but loses prime, bubbles in the pump lid: air is getting in on the suction side. Common spots are a low water level, a cracked pump lid o-ring, a loose drain plug, or a skimmer weir stuck closed. Rarely it is a cracked underground suction pipe.
Nothing at all, no hum: tripped breaker, failed timer or automation relay, or the motor is dead. Check the breaker and timer before calling.
Weak flow, pressure gauge low: clogged impeller, full pump basket, or a dirty filter upstream making the pump work against a wall.

What a technician will check

A tech will check voltage at the motor, test the capacitor, spin the shaft by hand to feel for bearing roughness, pull the pump basket and impeller, and pressure the suction side to find air leaks. On a variable-speed pump they will read the drive's error codes, which usually name the problem. They should also tell you the motor's age and horsepower, because that decides whether a repair is allowed to be a repair.

What it costs in Las Vegas

Repair	Las Vegas range
Capacitor replacement	$120 to $250
Pump lid o-ring, drain plugs, basket	$75 to $200
Motor bearings and seal	$150 to $350
Replace the motor only	$350 to $700
New variable-speed pump, installed	$800 to $2,500

These are Las Vegas ranges to judge a quote by, not a quote. The big spread on a new pump comes from horsepower, brand, and whether the installer has to replumb the pad. A simple swap onto existing unions is at the low end. Adding automation or moving the pump is the high end. Running cost matters too: a variable-speed pump in Las Vegas costs roughly $150 a year to run on NV Energy rates, against several hundred for an old single-speed, so the upgrade pays for itself in two or three summers.

The variable-speed rule

Since July 2021 a federal Department of Energy efficiency standard has applied to residential pool pumps. In practice it means a new pump of about 1 horsepower or larger has to be variable speed, because single-speed pumps that size cannot meet the standard. A second DOE rule, finalized in September 2023, extends the requirement to replacement motors sold on their own, phasing in through 2027. Nevada's own appliance efficiency law (AB 383, 2021) covers items like portable spas but did not add a separate pool pump rule, so in Las Vegas the federal rule is the one that applies. What it means for you: if your single-speed motor dies, a reputable company will quote a variable-speed replacement, and you should be suspicious of a cheap single-speed swap that claims to be new stock.

When to call

Call the same day if the pump is silent or screaming in June through September; the pool will not wait. If it hums and clicks, you can check for debris in the impeller yourself with the power off, but leave the capacitor to someone who knows how to discharge it. If a company quotes a full pump for a pump that only hums, ask them to test the capacitor first and put the result in writing.

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