Jandy Pool Heater FAULT-HIGH FLUE TEMPERATURE Error Code

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

Quick answer

High Flue Temperature Fault Exhaust gas temperature has exceeded the safe limit. Flue temperature limit fault, loose connections, failed flue sensor. Contact a service professional. Check for loose connections. Replace flue sensor if faulty.

Severity: high · DIY difficulty: intermediate

Safety

TBD - must be written per-code before publish

What FAULT-HIGH FLUE TEMPERATURE means

High Flue Temperature Fault Exhaust gas temperature has exceeded the safe limit. Flue temperature limit fault, loose connections, failed flue sensor. Contact a service professional. Check for loose connections. Replace flue sensor if faulty.

Code meaning varies by series

  • JXi 200/260/400 & LXi 250/400: FAULT-HIGH FLUE TEMPERATURE: flue temperature limit fault - loose connections or failed flue sensor.

Causes, ranked

  1. 1. Flue temp limit fault. occasional pro-only

    Check:

    Fix:

  2. 2. Loose connections. occasional pro-only

    Check:

    Fix:

  3. 3. Failed flue sensor. 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