Polaris Polaris 9550 Sport Robotic Pool Cleaner MECH-DEBRIS-LEFT Error Fix: Leaves Debris Behind — Poor Vacuuming

Error code MECH-DEBRIS-LEFT on the Polaris Polaris 9550 Sport Robotic Pool Cleaner means: Leaves Debris Behind — Poor Vacuuming. The cleaner runs a full cycle but leaves debris on the pool floor or walls: (1) Filter canister full — a full filter stops suction entirely. Empty it before each use. (2) Worn brushes — if the scrubbing brushes are worn, they don't agitate debris off the surface for the pump to capture. Replace worn brushes. (3) Pump impeller clogged — small debris can pass the filter and clog the internal pump impeller, reducing suction. Open the pump housing and clear the impeller. (4) Intake port obstructed — check the intake opening on the bottom of the cleaner for lodged debris. (5) Run a second cycle — for heavily soiled pools, one cycle may not capture everything. (6) Fine debris (sand, algae) may require a fine-mesh filter canister rather than the standard mesh.

The most successful fix is "Replace Worn Brushes and Clear Pump Impeller" (medium difficulty, ~45 minutes). Estimated DIY cost: $20-$40. HomeMD has 2 community-ranked fixes for this error.

This error is rated info severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Yes — the top-ranked community fix ("Replace Worn Brushes and Clear Pump Impeller") is rated medium difficulty and takes about 45 minutes. Tools needed: T20 Torx screwdriver, Small brush, Tweezers.

DIY cost: $20-$40. Professional repair typically costs $150-$220. Many homeowners save money by trying the top-ranked community fix first.

The Polaris Polaris 9550 Sport Robotic Pool Cleaner has 8 other known error codes, including: APP-CONNECT (iAquaLink App Cannot Connect (iQ Models)), LED-GREEN-BLINK (Power Supply Blinking Green LED — Timer / Delay Active), LED-OFF (No LED on Power Supply — No Power), LED-RED-BLINK (Power Supply Blinking Red LED — Communication Error), LED-RED-SOLID (Power Supply Solid Red LED — Motor Stall / Stuck), and 3 more.

Error code MECH-DEBRIS-LEFT also appears on 3 other Polaris models: Polaris Alpha iQ+ Robotic Pool Cleaner with iAquaLink, Polaris P965iQ Robotic Pool Cleaner with iAquaLink, Polaris VRX iQ+ Robotic Pool Cleaner with iAquaLink. The fix may vary by model, so check each model's specific page for tailored repair steps.