Jandy Pool Heater LED Double Flash Error Code

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

Quick answer

Flame Exists When No Call for Heat Flame Exists When No Call for Heat. Flame detected when the heater should not be firing. Turn off heater immediately. Contact a qualified service technician. Do not operate until inspected.

Severity: high · DIY difficulty: intermediate

Safety

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What LED Double Flash means

Flame Exists When No Call for Heat Flame Exists When No Call for Heat. Flame detected when the heater should not be firing. Turn off heater immediately. Contact a qualified service technician. Do not operate until inspected.

Code meaning varies by series

  • JXi 200/260/400 & LXi 250/400: LED double flash: flame exists when there is NO call for heat - gas valve or flame-sense issue; refer to qualified service personnel.

Causes, ranked

  1. 1. Flame exists when there is NO call for heat. Refer to qualified service personnel. 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