Water Pump Not Pumping Water? 9 Causes and Fixes (Kenya 2026)
A pump that runs but gives no water, hums without turning or keeps tripping usually has one of a handful of problems. Work through them in order, from the simplest, before calling a technician.
Quick answer: If a pump runs but gives no water, it has usually lost prime, the foot valve is leaking or there is an air leak on the suction side. If it hums but does not turn, suspect a failed start capacitor, a jammed impeller or low voltage. Low pressure points to a blocked impeller, a partly closed valve or worn parts. A controller with dry-run protection, such as the Pedrollo Easy Press (KSh 24,000), protects the pump while you find the fault.
Quick Fault Finder
| Symptom | Likely cause | Fix |
|---|---|---|
| Runs, no water | Lost prime; dry suction | Prime the pump (see below) |
| Runs, no water after priming | Leaking foot valve; air leak at joints | Clean or replace the foot valve; re-seal joints |
| Hums, does not turn | Failed capacitor; jammed impeller | Test/replace capacitor; free the impeller |
| Starts then trips | Overload, wrong cable size, low voltage | Check cable and voltage; get an electrician |
| Low pressure | Blocked impeller or strainer; partly closed valve | Clean strainer and impeller; open valves |
| Starts and stops often | Pressure tank or controller fault; small leak | Check the tank pre-charge and pipes for leaks |
| Noisy, rattling | Cavitation (suction too high) or worn bearings | Lower the pump; service bearings |
| Leaks at the shaft | Worn mechanical seal | Replace the seal |
| Does nothing | No power, tripped breaker, burnt motor | Check supply; electrician to test motor |
Step 1: Check Power and Prime
Confirm the socket and breaker, then prime the pump: how to prime a water pump.
Step 2: Check the Suction Side
- Is the foot valve under water and clean?
- Any cracked pipe or loose union? Re-seal with thread tape.
- Is the pipe the same size as the pump inlet?
- Is the pump too high above the water?
Step 3: Check the Impeller and Capacitor
With the power off, a technician can open the casing to clear debris from the impeller and test the start capacitor. Single-phase pumps that hum but will not start very often only need a new capacitor.
Safety first: electrical work must be done by a qualified, licensed electrician. Switch off at the main switch before touching any wiring.
Step 4: Protect the Pump
Dry running and frequent starts are the main pump killers. A pressure controller with dry-run protection stops the pump when water runs out and restarts it automatically.
KSh 24,000
KSh 6,000
KSh 9,200
KSh 24,500
KSh 23,500
KSh 700
Some photos are reference images of the product type, used under open licences. Image credits are on each product page.
| Product | Use | Price |
|---|---|---|
| PEDROLLO EASY PRESS PUMP CONTROLLER | Dry-run protection and auto restart | KSh 24,000 |
| Automatic Pump Pressure Controller and Switch Kit | Pressure control and dry-run protection | KSh 6,000 |
| PEDROLLO EASY SMALL | In-line pressure controller | KSh 9,200 |
| DAVEY JETPLUS JY350 | Replacement jet pump | KSh 24,500 |
| Foot Valve 1 Peg | Suction foot valve | KSh 700 |
Worked Example: A Pump That Hums in the Morning
A household pump hums but will not start after a night of power fluctuations. The breaker is fine and the pump is primed. The technician finds a failed start capacitor, replaces it, and recommends a voltage guard and a controller with dry-run protection.
Common Mistakes to Avoid
- Repeatedly switching on a pump that only hums.
- Ignoring a dripping shaft seal.
- Using a thin extension cable to power the pump.
- Running without dry-run protection on a tank that empties.
Not sure which one fits? Send us your details on WhatsApp or through the product page and we will help you choose.
Frequently Asked Questions
Why is my water pump running but not pumping water?
Most often it has lost prime, the foot valve is leaking or the suction line has an air leak.
Why is my pump humming but not working?
Usually a failed start capacitor, a jammed impeller or low voltage.
How do I know if my pump capacitor is bad?
The motor hums but does not spin, or spins only if helped; an electrician can test it with a meter.
Why does my pump keep switching on and off?
A leak, a faulty pressure switch or controller, or a pressure tank that has lost its air charge.
Can low voltage damage a pump?
Yes, it makes the motor overheat; fix the supply or use a voltage protector.
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