A Pool Service Checklist For When The Water Looks Dead

Show Notes

You walk into the backyard and your stomach drops: the surface is covered in debris, there’s dust floating on top, and the cleaner looks like it gave up days ago. When a pool “isn’t working,” the fastest path to a fix is a calm, repeatable troubleshooting order, and that’s what I lay out here for pool service techs and anyone responsible for pool circulation and water clarity. 

I start at the controls because the easiest failures are often human ones. Standalone variable speed pumps can get knocked out of their weekly schedule with a single Start/Stop press, and some customers will do it just to quiet the equipment during a party. From there, I move through automation and timers, including what to look for with mechanical trippers, what a quick reset can solve on certain panels, and why a bad relay can trick you into thinking the pump motor is dead. 

Next we use the numbers that don’t lie: filter PSI and flow. Low pressure can point to an impeller clog or diffuser issue, and I explain a simple way to clear debris and verify the pump basket isn’t cracked. High pressure usually means the filter is dirty, so we cover DE backwash and recharge, sand backwash, cartridge cleaning, and the telltale signs that cartridges or grids are simply worn out. I also hit cleaner-side problems like jammed heads, skimmer restrictions, side-port issues, and vac lock shutoffs, plus the overlooked reality that the runtime might be set far too low. 

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A pool that looks like it hasn’t run all week usually has a simple cause if you troubleshoot in the right order. I walk through a practical checklist to confirm the pump schedule, pinpoint control problems, and restore flow before you start replacing parts.
• spotting the visual signs of poor circulation and cleaner stoppage
• checking standalone VS pump Start/Stop mistakes and customer habits
• resetting automation when schedules glitch and verifying timers and trippers
• diagnosing bad relays in automation panels before blaming the motor
• recognizing capacitor failure sounds and confirming power to the pump
• using filter PSI to separate impeller clogs from dirty filter problems
• clearing the impeller safely and inspecting the pump basket for cracks
• backwashing DE and sand filters and cleaning cartridge filters properly
• identifying worn cartridges or DE grids when performance drops fast
• fixing suction-side cleaner clogs plus side-port vac lock shutoffs
• confirming runtime settings when the system runs too few hours
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