Jandy Pool Heater FAULT-HIGH LIMIT Error Code

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

Quick answer

High Limit Temperature Fault Water temperature inside the heater exceeds the internal high limit. Insufficient water flow, blocked vent, limit switch fault. Check water flow and clean filter. Inspect vent for obstructions. Replace limit switches if faulty.

Severity: high · DIY difficulty: intermediate

Safety

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What FAULT-HIGH LIMIT means

High Limit Temperature Fault Water temperature inside the heater exceeds the internal high limit. Insufficient water flow, blocked vent, limit switch fault. Check water flow and clean filter. Inspect vent for obstructions. Replace limit switches if faulty.

Code meaning varies by series

  • JXi 200/260/400 & LXi 250/400: FAULT-HIGH LIMIT: water temperature in heater exceeds the internal limit (limit switch fault or insufficient flow / blocked vent).

Causes, ranked

  1. 1. Water temperature in heater exceeds the internal limit. occasional pro-only

    Check:

    Fix:

  2. 2. Limit switch fault. occasional pro-only

    Check:

    Fix:

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

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Commonly searched as: "jandy fault-high limit" · "jandy error code fault-high limit" · "jandy air conditioner fault-high limit"

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