Pool Pump Problems: 7 Signs You Need a Repair or Replacement
The pump is the heart of your pool. It pulls water through the weir, pushes it through the filter and back through the returns, and carries the chlorine to every corner. When it stops, nothing is filtered, and in a hot Gauteng week the water can turn in a matter of days. Most pump faults give some warning first. Here are the seven signs to watch for, what you can safely check yourself, and how to decide between repairing and replacing.
How does a pool pump work?
A pool pump is an electric motor driving an impeller inside a pump housing. The spinning impeller creates suction on the inlet side, which draws water from the weir and main drain through the pump basket, and pressure on the outlet side, which pushes it through the filter and back to the pool. A mechanical seal stops water running along the shaft into the motor, bearings let the shaft spin smoothly, and a capacitor gives a single-phase motor the kick it needs to start. Nearly every pump fault involves one of those parts.
The 7 signs your pump needs attention
1. It is screeching, grinding or whining
A high-pitched screech or a grinding rumble from the motor end almost always means worn bearings. Bearings wear with age, and faster when water from a leaking seal gets into the motor. The pump may keep running for a while, but a bearing that seizes can take the motor with it. Replacing bearings early is far cheaper than replacing a motor.
2. It hums but will not start
A pump that hums without turning usually has a failed start capacitor, or an impeller jammed by a stone, a seed pod or a piece of leaf. Switch it off rather than trying again and again: a motor that is powered but cannot turn heats up quickly and can burn out.
3. Water is dripping underneath it
A steady drip or puddle below the join between the pump housing and the motor is the mechanical seal. Seals wear out, dry out if the pump runs without water, and suffer when the water chemistry is badly out of balance. Fix it promptly, because the water tracks along the shaft into the motor bearings.
4. There are air bubbles in the pump basket or the returns
Air in the system means air is getting in on the suction side. The common causes are a low pool level (the weir sucks air once the water drops below the middle of its opening), a cracked or dry lid O-ring, a lid that is not seated evenly, or a leaking suction fitting. An air-bound pump moves less water and runs hotter.
5. Flow is weak, or the pump will not prime
Weak flow from the returns usually has a simple cause: a full weir or pump basket, a filter that needs backwashing, or a partly blocked impeller. If the pump will not prime at all, check the water level, the lid O-ring, and that the valves on the suction side are open.
6. It trips the power or cuts out
A pump that trips the earth leakage has moisture or a fault in the motor or its wiring. Leave it off and have it looked at — water and electricity are not a do-it-yourself fault. A pump that runs for a while, gets very hot and cuts out may be starved of water, poorly ventilated inside a closed pump box, or near the end of its life.
7. It uses more electricity than it used to
A motor with dragging bearings or a partly blocked impeller works harder for the same flow. If your electricity bill has climbed with no other explanation, the pump is worth checking. Pumps that run long hours are also where an energy-saving variable-speed model can make sense — but the saving depends on your pool and your tariff, so compare it properly rather than trusting a generic figure.
What can I check before calling someone?
Always switch the pump off at the isolator before opening anything. Then:
- Empty the weir basket and the pump basket.
- Check the pool level is at least halfway up the weir opening.
- Inspect the lid O-ring for cracks, flattening or grit, and seat the lid evenly.
- Make sure the multiport valve is firmly on Filter, not between positions.
- Check the timer is running the pump at the hours you think it is, particularly after load-shedding.
If none of that helps, stop there. Opening the motor, replacing a capacitor or working on the wiring should be left to someone who does it every day.
Does load-shedding damage pool pumps?
It can shorten their life. The surge when power returns stresses the capacitor and motor, and many mechanical timers lose time or reset after every outage, so the pump ends up running at the wrong hours or not at all. After a run of outages, check the timer and listen to the pump. A surge protector on the pool circuit is worth discussing with your electrician. If you are replacing the pump anyway, a variable-speed pump draws much less at low speed, which makes it more practical to run from backup power or solar.
Should I repair or replace my pool pump?
Repair when the fault is a wear part — bearings, a seal, a capacitor, an impeller, a lid or an O-ring — and the rest of the pump is sound. Those parts are standard, and replacing them gives a good pump years more life.
Replace when the motor has burnt out, the housing is cracked, parts are no longer made for that model, or the pump was the wrong size for the pool in the first place. An oversized pump wastes electricity and pushes water through the filter too fast; an undersized one never turns the pool over properly. When we quote a replacement, we look at the pool's volume, the pipe runs and the filter it has to work with, not just the label on the old motor.
Our online pool shop stocks pool pumps and energy-saving pumps from Speck, Quality, EartheCo and Aquagem, and we fit what we sell. Quoting a new pump or its installation costs nothing.
What does a pool pump repair cost?
A pool pump repair or service is R850. That covers diagnosis and the repair labour; parts are extra and quoted before they are fitted. If you would rather have the equipment inspected before deciding anything, a call-out is R650, deducted from your quote when you accept it. We do pump work across Pretoria, Centurion and Midrand.
A pump that works but is getting noisy benefits from a service before it fails: bearings checked by sound and feel, the seal inspected, the impeller cleaned, a tired lid O-ring replaced, and the capacitor and electrical connections checked. It is the same visit and the same price, and a lot cheaper than a pump that seizes in the middle of December.
How do I make a pool pump last longer?
- Keep the baskets empty, so the pump is never starved of water.
- Keep the pool level up, especially in the dry, windy weeks of late winter.
- Never run it dry, and never restart a pump that hums without turning.
- Give it shade and ventilation; a closed box in full sun cooks a motor.
- Keep the water balanced; aggressive water shortens the life of the seal.
- Have a noisy pump looked at early, while it is still a bearing and not a motor.
Frequently asked questions
How long should a pool pump last?
It depends on the pump, how many hours it runs, and how dry and ventilated its housing is. Seals and bearings usually wear long before the motor itself, and replacing them extends its life considerably.
Can I run my pool pump without water?
No. Running dry destroys the mechanical seal quickly and can damage the impeller and housing. If the pump has lost prime, switch it off and fix the cause first.
Why does my pump keep losing prime?
Air is getting in on the suction side: a low water level, a leaking lid O-ring, or a cracked suction pipe or fitting. A leak on that side lets air in rather than water out, so there may be no puddle to find.
Is it the pump or the filter?
If the pressure gauge is high and flow is weak, the filter usually needs backwashing. If the pressure is low and flow is weak, the problem is usually on the suction side — the baskets, the water level or the pump itself.
Talk to us
WhatsApp or call Crystal Reef on 081 577 5051 with a photo of the pump label and a short video if it is making a noise, or email sales@crystalreef.co.za. If the pump is fine but the water is not, read pool filter types explained, or see pool repairs for chlorinators, lights, valves and weirs.