First identify what has stopped: the cleaner’s movement, its water collection, or its coverage. Then identify the cleaner type. A robot, a suction cleaner, and a pressure cleaner use different supplies, so the same symptom can lead to different checks.
Stop using equipment with damaged electrical parts, a tripping protective device, or an unsafe pool drain cover. For an ordinary cleaning fault, record what you see before changing settings or ordering parts.
Identify the supply
A robot has its own power and collection system. A suction cleaner uses water drawn toward the pool pump. A pressure cleaner receives pressurized water, sometimes from a system with a booster pump.
If you are unsure which you own, start with pool cleaner types. Do not assume that a hose powered cleaner has an electrical motor inside, or that a robot depends on the pool pump for suction.
Choose the symptom that matches
| Observation | First distinction | Diagnostic route |
|---|---|---|
| Robot stays still | Power or program state versus an obstruction or drive fault | Robot not moving |
| Robot travels but will not climb | Approved wall capability versus a new performance change | Wall climbing checks |
| Suction cleaner moves slowly or stops | Water supply and hose path versus cleaner mechanism | Suction cleaner checks |
| Pressure cleaner loses movement | Feed supply, bag, hose, and model adjustment | Pressure cleaner checks |
| Robot stops at the drain repeatedly | Geometry or suction influence versus general movement failure | Drain obstruction checks |
Watch whether the cleaner stops everywhere or only at one feature. Also note whether the problem begins immediately or after part of a cycle. Those observations help separate a supply problem from a particular obstacle or loaded filter.
If it moves but leaves dirt behind
Inspect the collection bag or filter with the cleaner safely powered down. Check for loading, torn media, incorrect seating, and accessible intake obstructions. A moving cleaner can still have poor water collection.
Then compare the dirt with the collection media. Fine sediment can escape a coarse basket even when the cleaner appears active. Use fine debris selection when the issue is retention rather than movement.
If it never reaches part of the pool
Check the permitted pool dimensions, operating depth, and coverage for the exact model. Confirm that its hose or cable reaches from the approved connection position. Extra length is not always helpful because it can introduce loops or change hose behavior.
Separate floor, wall, waterline, shelf, and step coverage. A floor only robot is not broken because it fails to clean a vertical wall. A new obstacle or an altered return direction can also change the route.
Use the timing of the fault to narrow the search
A cleaner that has never worked in this pool needs a compatibility and installation check. A cleaner that worked yesterday needs a review of recent changes as well. New hose sections, filter service, valve changes, and a different cleaning mode are useful starting points.
Consider a suction cleaner that slows only after the pump enters its evening setting. The timing points toward checking flow at that setting. It does not establish a broken cleaner mechanism.
By contrast, a robot that travels normally until its filter fills needs a collection and maintenance check. Increasing the pool pump speed does not clean that onboard filter. Matching the observation to the supply type avoids an irrelevant adjustment.
Write a short fault record before calling for help
Record the exact model, how it is connected, and when it last worked normally. Add the selected program or operating setting. Note any recent maintenance without assuming that maintenance caused the fault.
Describe what still works. “Travels across the floor but slides on every wall” is more useful than “does not clean.” “Collects leaves but releases fine dirt” directs attention toward retention rather than travel.
Include one clear photo of the setup and a short video showing the failure from a safe position. Record the result of the manufacturer’s basic maintenance checks. That gives support evidence to assess without requiring you to name a failed internal part.
Change one condition, then observe
Begin with the maintenance and setup checks in the model manual. After correcting a blocked filter or an incorrect setting, observe another permitted cycle. Record whether the original symptom changed.
Avoid combining several adjustments and a parts replacement in one attempt. You may restore movement without learning which condition caused the failure. If the fault persists, give service support the model, supply type, exact symptom, and checks already completed.
Do not bypass a protective control or open a sealed robot motor to keep troubleshooting. A useful service report narrows the problem; it does not need a guessed part diagnosis.
