Page 47
Jandy
®
JXi
™
Gas-Fired Pool and Spa Heater | Installation & Operation Manual
10.2 Service Diagnostic Messages
The controller monitors several functions of the heater. In the event of a malfunction, the controller will display
a FAULT message. The following table lists the Heater Service Messages along with potential causes and
remedies.
Fault Message Possible Cause Remedy
CHECK FLOW Pump is not running.
Low pump pressure.
Pressure switch fault.
Variable speed pump set too low.
Check breakers and power source, recheck wiring,
set time clock and current time.
Clean filter or clear blockage, check position of
valve in plumbing system.
Make sure return eyeball fittings are installed on the
wall of the pool.
Adjust or replace pressure switch.
Adjust variable speed pump.
Refer to qualified service personnel.
FAULT-
HIGH LIMIT
Water temperature in heater exceeds the
internal limit.
Limit switch fault.
Inspect vent for obstructions or blockages.
Indoor installations, check vent pipe for bird, insect
or rodent activity that could cause a blockage.
Replace switches.
Refer to qualified service personnel.
FAULT - HIGH FLUE
TEMPERATURE
Flue temp limit fault Identify and correct loose connections.
Replace flue sensor.
Refer to qualified service personnel.
FAULT-
CHECK IGN CONTROL
Broken, split, pinched or disconnected air
pressure switch tubing.
Fan not operating.
Fan running slow
Premature fan failure.
Air flow restricted at intake or discharge.
Broken igniter.
Low gas supply pressure/volume.
No flame at burner.
Check tubing and replace if necessary.
Correct fault or replace fan.
Replace igniter.
Verify proper wiring for 120 VAC or 240 VAC.
Check for proper clearances around heater and for
adequate room ventilation if enclosed. Inspect for
blockage or restriction at discharge of flue.
Check ignition control LED codes (see Section 10.3,
Ignition Control LED Service Codes).
Verify that the size, length and number of elbows on
the gas supply line meet national codes.
Identify and correct loose wiring connections, or
problems with igniter, gas valve, or ignition control.
Refer to qualified service personnel.
FAULT-
SHORTED H2O SENSOR
or
FAULT-
OPEN WATER SENSOR
Faulty wiring or connection.
Failed water temperature sensor.
Inspect water temperature sensor wiring.
Ensure sensor is connected correctly into the power
interface board (PIB).
Replace water temperature sensor.
Refer to qualified service personnel.
FAULT-
PUMP
Status message indicating the filter pump is
currently turned OFF when the heater system
programmed in Maintain Temp mode.
No Service Required. This is normal when the
control is in a Maintain Temp mode.
AUX Monitor Check VersaFlo
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