What it usually means, the likely causes in order, what to safely try first, what a pro charges in Canada, and when to stop and call one.
This guide covers the common cases. Describe your exact problem and get a personalized diagnosis — free to start, with a DIY vs. call-a-pro verdict and a real cost estimate.
A pool or spa pump or heater that will not start, or has no power at all, most often traces to a tripped GFCI breaker or a failed pump motor, with a few control and switch faults in between. Because this equipment combines water and electricity in one place, the diagnostic order matters as much as the diagnosis: describe what you observe, check the breaker once, and listen from a dry, safe position. A pump that hums without spinning is telling a different story from one that is completely silent, and a heater that will not fire is a different fault again, so note exactly which equipment is dead and what it does when called.
A dead pump is not a safety emergency once power is safely off, but it becomes a water-quality problem quickly: uncirculated, unfiltered water turns cloudy and unsanitary in warm weather, so book within days rather than weeks in the swimming season. Act the same day if there is any sign of electrical trouble — repeated breaker tripping, a burning smell, scorch marks, or a GFCI that will not reset — because those mean the fault is active, not just inconvenient.
Pool and spa equipment is protected by ground-fault devices precisely because water and electricity meet there. A genuine ground fault, moisture in a connection, or an aged GFCI reaching the end of its life can all cut power. One reset attempt is reasonable; a device that trips again immediately is reporting a fault, not being stubborn.
Motors wear bearings, overheat, and seize, especially after sitting idle over a winter or running with poor water flow. The classic sign is a hum when the pump is called, with no spin and no water moving, sometimes ending in the breaker tripping as the motor strains against its own failure.
Mechanical timers lose their settings or their clock motors fail, switches corrode in the damp equipment environment, and spa controls and sensors can refuse to call for heat or circulation. Equipment that runs when switched manually but never on schedule points at this layer rather than at the motor.
When the pump runs but the heater will not start, the fault is usually in the heater own chain of safeties and sensors: it will not fire without proven water flow, and it shuts down for ignition failure, pressure-switch faults, or overheating history. A silent heater with a working pump is therefore its own diagnostic branch.
| Job size | Typical estimate (CAD) |
|---|---|
| Simple fix — the straightforward version of this repair | $100–$250 |
| Major job — complex, hidden, or replacement-level work | $300–$1,200 |
Estimates only, calibrated to Greater Toronto Area trade rates and adjusted by region on this site — not a quote. Your exact price depends on the cause, parts, and access. A personalized diagnosis narrows this range using your specific symptom.
Checking and resetting a GFCI once, confirming timer settings, restoring water level, and opening a mis-set valve are the reasonable limits of homeowner diagnosis here. Everything electrical beyond that — motor replacement, GFCI or breaker work, heater ignition and internal controls, bonding questions — belongs with a qualified pool or spa technician or electrician who works on wet-environment equipment regularly. Describe the hum-versus-silence detail and any codes when booking, because that observation genuinely shortens the visit.
No. Reset once; a GFCI that trips again straight away is detecting a ground fault or has failed itself, and repeatedly forcing it defeats the protection it provides beside water. Leave the power off, keep people out of the water until it is assessed if the fault could involve equipment in contact with the pool, and have a qualified technician find whether the fault is in the motor, the wiring, or the device.
A humming motor that does not turn is usually seized, has a failed starting component, or is being prevented from rotating, and it will overheat if left humming. Switch it off rather than coaxing it. This symptom is worth reporting exactly when you book, because a technician will arrive expecting motor work rather than a supply problem, and the repair-versus-replacement discussion for the pump can start from the right place.
Usually not. The heater has its own safety chain and will not ignite without adequate water flow proven to its satisfaction, plus working ignition and sensors. Low flow from a dirty filter can therefore masquerade as a heater fault. Clean filtration first, confirm strong circulation, and if the heater still refuses with good flow, it needs its own service rather than more attention to the pump.
Not long in warm weather. Without circulation and filtration, sanitiser distributes poorly, algae gains a foothold, and water can move from clear to cloudy to green surprisingly fast, turning a motor repair into a motor repair plus a water recovery project. Keep the cover on, keep people out if the water deteriorates, and prioritise the booking; if the delay stretches, ask the technician what interim steps they recommend for your specific setup.
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