Jandy JXi 260 260,000 BTU Pool Heater with High Efficiency and Digital Temperature Control FLO Error Fix: Flow Fault — Insufficient Water Flow

Error code FLO on the Jandy JXi 260 260,000 BTU Pool Heater with High Efficiency and Digital Temperature Control means: Flow Fault — Insufficient Water Flow. The flow switch is open indicating insufficient water flow through the heater — the heater will not fire without confirmed flow; causes include pump not running or running at too low a speed (variable speed pumps need at least 40 GPM through the heater), a dirty pool filter restricting flow (check filter pressure gauge), closed or partially closed isolation valves on the heater plumbing, the heater bypass valve opened too far (diverting water around the heater), a blocked or scaled heat exchanger, or a defective flow switch; check filter pressure and clean if needed; ensure pump is running at adequate speed; verify all heater isolation valves are fully open

The most successful fix is "Test and Replace Flow Switch or Clear Heat Exchanger Blockage" (medium difficulty, ~60 minutes). Estimated DIY cost: $10-$20. HomeMD has 2 community-ranked fixes for this error.

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Yes — the top-ranked community fix ("Test and Replace Flow Switch or Clear Heat Exchanger Blockage") is rated medium difficulty and takes about 60 minutes. Tools needed: T20 Torx screwdriver, Multimeter, Bucket, Garden hose.

DIY cost: $10-$20. Professional repair typically costs $200-$300. Many homeowners save money by trying the top-ranked community fix first.

The Jandy JXi 260 260,000 BTU Pool Heater with High Efficiency and Digital Temperature Control has 8 other known error codes, including: AFS (Air Flow Switch Fault), AGS (Air/Gas Switch Fault), CE (Communication Error), CF (Combustion Fan Fault), FE (Flue Exhaust Fault), and 3 more.

Error code FLO also appears on 2 other Jandy models: JXi 400,000 BTU Pool and Spa Heater with Digital Temperature Control, LXi 400,000 BTU Low NOx Pool and Spa Heater. The fix may vary by model, so check each model's specific page for tailored repair steps.