Page 46
Jandy
®
JXi
™
Gas-Fired Pool and Spa Heater | Installation & Operation Manual
Section 10. Troubleshooting
10.1 Common Problems
Zodiac Pool Systems LLC strongly recommends that you call a qualified service technician to perform all
service and repairs on the heater. To locate a licensed or qualified technician service company, call Jandy
Technical Support at 800.822.7933, or visit www.jandy.com.
The following table lists some of the most common problems when running the heater. Most problems occur
when the heater is started for the first time after installation or at spring start-up.
Symptom Possible Cause Remedy
Pump not operating No power.
Pump defective.
Incorrectly wired.
Time clock settings not synchronized
with actual time.
Check circuit breakers and power source.
Replace the pump.
Recheck wiring.
Check time clock setting.
Unstable combustion-
(1) heater turns off and on
(2) heater ignites slowly
(3) flame lifts and goes out
(4) short yellow streaked
flame
Wrong gas.
Lean fuel/air mixture— low supply
pressure.
Lean fuel/air mixture— too much
combustion air.
Rich fuel/air mixture— high manifold
pressure.
Rich fuel/air mixture— too little
combustion air.
Make sure the gas supply matches the gas type indicated
on the rating plate.
Correct gas supply inlet pressure to:
- (NATURAL GAS) 4.0 in W.C. min - 10.5 in W.C. max
- (PROPANE) 4.0 in W.C. min - 14.0 in W.C. max
Offset pressure should be -0.2 in W.C. Use a digital
differential manometer to verify correct offset pressure.
Adjust offset pressure as needed.
Connect a digital differential manometer to blower throat
and gas valve port to obtain differential. Make sure the
differential value falls within the specified range for the
heater size.
Gas meter too small.
Gas line from meter to heater too small.
Check blower inlet grill for obstruction.
Not enough heat
(1) heater is slow to heat up
(2) heater not maintaining
set temperature
(3) Low temperature rise
Heater size inadequate.
Filter pump not running long enough.
Thermal regulator valve (TRV) is
opening early or is permanently open.
Heater plumbed backwards.
Replace with heater of higher output.
Replace TRV.
Heater is condensing. Flue product moisture will condense
at the start-up until the heater water temperature reaches
the normal operating conditions.
Correct the plumbing.
Heater pounding or
knocking
Water flow through heater too low.
Failed Thermal Regulating Valve (TRV).
Look for obstruction or closed valve in system.
Check for damaged internal bypass.
Variable speed pump set too low
Dirty filter or baskets
Igniter lights but heater does
not fire
Gas valve is not ON.
Air in gas line.
No power to gas valve.
Low gas pressure/volume.
High burner throat pressure.
Gas valve failed.
Flip the switch to “on” position.
Cycle ignition sequence until air is out of the gas line.
Check controls for proper operation.
Check supply pressure/volume and verify proper gas supply pipe
size.
Replace gas valve.
NOTE: Gas valve failures are extremely rare. Please confirm this
as the root problem before replacing.
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