Hot tub pump repair
A hot tub pump that hums without starting, leaks, grinds or trips the GFCI needs attention before it takes other parts with it. We repair and replace jet and circulation pumps across the Fraser Valley.
Most hot tub pump problems show up in one of five ways: a hum with no water moving, water dripping under the pump, a loud bearing noise, a GFCI that trips when the pump starts, or jets that have gone weak. Some are quick fixes, like an airlock after a refill; others mean a new seal, a new motor or a new pump.
How a hot tub pump works
Hot tubs have one or more jet pumps, and many also have a small circulation pump that runs quietly for filtering and heating. Each pump has two halves: the motor, and the wet end, where an impeller spins inside a housing to move the water. A shaft seal between the two keeps water out of the motor. Two-speed jet pumps often handle filtering on low speed and the jets on high.
Signs and what they usually mean
| What you notice | Common causes |
|---|---|
| Hums but doesn't spin | Seized bearings, a jammed impeller, or a failed start capacitor on motors that have one |
| Water under the pump | A worn shaft seal, a loose union or a cracked wet end |
| Grinding, squealing or rumbling | Worn motor bearings, often after a leaking seal has let water into the motor |
| GFCI trips when the pump starts | Water in the motor or wiring, or a failing motor winding |
| Weak jets or no flow | A dirty filter, an airlock, a closed valve or a worn impeller |
| Runs, then shuts off | The motor overheating, from poor ventilation or a failing motor |
A leaking shaft seal is worth fixing early. Left alone, the water reaches the motor bearings, and a small seal job turns into a new motor.
Airlocks after a refill
If the pumps run but no water moves after you've drained and refilled the tub, the most likely cause is air trapped in a pump. Most owner's manuals explain how to bleed it, usually by loosening the union on the pump until water seeps out and then tightening it again, or by cycling the jets on and off a few times. Switch off power at the disconnect before touching anything in the equipment bay. If the jets are still dead after that, book a visit.
Repair or replace the pump?
Depending on what has failed, the fix can be:
- A new shaft seal and gaskets
- A new motor on the existing wet end
- A new wet end or impeller
- A complete new pump
A pump that has run noisily for a long time, with water damage in the motor and a worn wet end, is usually better replaced as a unit. A recent leak caught early is often just a seal.
Matching the replacement
A replacement has to match the original: the voltage (120 or 240 volts), the horsepower, the number of speeds, the frame size, the size and position of the plumbing connections, and how it's wired into the control pack. A pump that's too strong or wired wrong can trip the GFCI, overload the controls or starve other jets of water. That's why we ask for the make and model of the tub, and a photo of the label on the pump if you can take one.
Before you call
- Clean or replace the filter and check the water level
- Make sure the valves around the equipment are open
- Note whether the problem happens on low speed, high speed or both
- With the power off, photograph the pump label and any wet spots
FAQ
Questions
Something else on your mind? Ask us when you request a quote.
Why is my hot tub pump humming but not running?
Usually the motor can't turn: seized bearings, a jammed impeller or, on motors that have one, a failed start capacitor. Turn it off rather than leaving it humming, because a stalled motor overheats.
Why is water leaking from my hot tub pump?
The most common causes are a worn shaft seal, or a loose or cracked union where the pump joins the plumbing. Have it fixed soon, because water that reaches the motor bearings ruins the motor.
My jets stopped working after I refilled the tub. Is the pump broken?
Probably not. It's most likely an airlock. Follow the bleeding steps in your owner's manual with the power off, and book a visit if that doesn't bring the flow back.
Can you replace just the motor?
Often, yes. If the wet end and impeller are in good shape, a new motor can go on the existing wet end. We check both before recommending which way to go.
Valley Hot Tubs
Book a pump repair
Tell us the make and model, what the pump is doing and any error code on the panel.