Jandy JXi 400K BTU (Natural Gas)
HeaterModel: JXI400NN
400,000 BTU natural gas pool heater. Polymer headers resist corrosion. Compact design.
Specifications
| btu | 400,000 |
| fuel | Natural Gas |
| heat exchanger | Polymer Header / Cupro-Nickel |
Common Replacement Parts
| Part Number | Name | Category | Notes | Shop |
|---|---|---|---|---|
| R0591400 | Igniter | igniter | Hot surface igniter. Test with multimeter before replacing. | Search in Shop |
| R0496503 | Blower Motor | motor | Replace if heater makes whining noise or won't draft. | Search in Shop |
| R0591200 | Flame Sensor | sensor | Clean with fine emery cloth first. Replace if heater fires then shuts off immediately. | Search in Shop |
Troubleshooting
Heater won't fire
Possible Causes
- Bad igniter
- Gas supply issue
- Control board fault
How to Fix
Check igniter with multimeter. Verify gas valve is open. NEVER work on gas connections without proper license — call us.
r13 error code
Possible Causes
- Stack flue sensor tripped (overheating)
How to Fix
Check for obstructed exhaust. Verify adequate clearance around heater. May need sensor replacement.
Schematic & Parts
Schematic Coming Soon
We're working on adding an exploded parts diagram for this model.
Need this part?
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