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ENGLISH
Zodiac
®
JXi
™
Gas-Fired Pool & Spa Heater
|
Installation & Operation Manual
Section 10. Troubleshooting
10.1 Common Problems
Zodiac Group Australia 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 Zodiac, 1300 763 021,
or
visit www.zodiac.com.au,
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 - 1.13 kPa (4.5 " W.C.) min - 2.6 kPa
(10.5" W.C.) max
- PROPANE - 1.13 kPa (4.5 " W.C.) min - 3.5 kPa
(14.0" W.C.) max
•
Offset pressure should be -.05 kPa (-0.2" W.C.) Use
a digital differential manometer to verify correct offset
pressure. Adjust offset pressure as needed.
See
Section 4.3
•
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. See
Section 4.3
•
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.
•
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.
