Jandy JXi Pool/Spa Heater — Service Manual
Jandy JXi natural gas pool/spa heater service manual. Covers gas burner system, heat exchanger, flow management, electronic control board, error code diagnostics, and combustion analysis. High-efficiency 400K BTU unit common in commercial/HOA pool installations.
Key Specifications
Input: 400,000 BTU/hr. Fuel: Natural gas or propane (conversion kit). Efficiency: 84% thermal. Ignition: electronic direct spark. Minimum flow: 30 GPM. Inlet/outlet: 2.5". Control: Digital with remote option. Freeze protection: to 32°F.
Maintenance Schedule
Annual: inspect heat exchanger for scale, test flame sensor, verify gas pressure at inlet (3.5" WC NG), clean combustion air intake screen, inspect flue, check all sensor connections.
Common Issues
E01 (ignition failure — check flame sensor, gas valve coils), E06 (high limit — check flow), E05 (pressure switch — check water flow), heat exchanger scaling (reduced output, scale visible at header), control board display failures.