Jandy Pool Heater LED Single Flash Error Code

Updated 2026-08-29 · review status: manual-verified Last verified: 2026-08-29

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: intermediate

Safety

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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.

Causes, ranked

  1. 1. Air flow fault. occasional pro-only

    Check:

    Fix:

Parts & supplies for Jandy Pool Heater: filters, control boards, sensors, and common replacement parts.

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Sources

  • PoolDial error-code reference (manual-backed) — verified 2026-08-29
  • Jandy JXi Gas-Fired Pool and Spa Heater Installation & Operation Manual (Section 10.2 Service Diagnostic Messages, 10.3 Ignition Control LED Service Codes) — verified 2026-08-29
  • PoolDial Jandy JXi troubleshooting guide (fault-code table) — verified 2026-08-29