Jandy Pool Heater LED Single Flash Error Code

Updated 2026-08-30 · review status: manual-verified · reviewed by MiniSplitDecoder Editorial Team Last verified: 2026-08-30

Check your model first

  • JXi 200
  • JXi 260
  • JXi 400
  • LXi 250
  • LXi 400
  • JXi 200/260/400 & LXi 250/400

Match the model on your equipment label to the linked manufacturer documentation. The same code can mean different things across model families.

Quick answer

Air Flow Fault Air Flow Fault. The air pressure switch has detected insufficient combustion air. Broken/pinched air pressure switch tubing, fan not operating or running slow, air flow restricted at intake or discharge. Check air pressure switch tubing for damage. Verify fan operation. Inspect intake and exhaust for blockage.

Severity: high · DIY difficulty: easy

Safety

Stop at the exterior: power-cycle at the disconnect, clean the filter/basket, and check for obvious water-flow blockage. Pool heaters combine gas piping, 240 V wiring, and (on heat pumps) refrigerant — burner, control-board, and sealed-system work requires a licensed technician. If you smell gas, shut the gas valve and leave the area first.

What LED Single Flash means

Air Flow Fault Air Flow Fault. The air pressure switch has detected insufficient combustion air. Broken/pinched air pressure switch tubing, fan not operating or running slow, air flow restricted at intake or discharge. Check air pressure switch tubing for damage. Verify fan operation. Inspect intake and exhaust for blockage.

Code meaning varies by series

  • JXi 200/260/400 & LXi 250/400: LED single flash: air flow fault - combustion air not detected by the air pressure switch.

First checks before service

This page currently documents the safe reset triage. If the code returns, use the linked source manual or a qualified technician for code-specific diagnosis.

  1. 1. One-time fault event (power disturbance or transient sensor reading) common DIY

    Check: Power-cycle at the breaker/disconnect (or unplug for CPAP), restore, and run the system while watching for the code.

    Fix: If the code does not return after a full run cycle, the fault was transient — monitor, no repair needed.

  2. 2. Fault persists after a clean reset occasional pro only

    Check: If the code returns immediately or every session, note the conditions (startup, heating, after rain).

    Fix: A persisting code points at the component the manual assigns to this code — that repair is technician territory.

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Sources

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