Page 42<strong>LXi</strong> Pool/Spa Heater Installation <strong>and</strong> Operation ManualTable 11. <strong>LXi</strong> Heater Service Diagnostic GuideDISPLAY FAULT CAUSE REMEDYDisplay showsFAULT-PUMPDisplay showsNO FLOWFAULT-HIGH LIMITFAULT-FUSELINK/FIELDFAULT-CHECK IGN CONTROLFAULT-SHORTED H2O SENSORorFAULT-OPEN WATER SENSOR1. Pump is not running. 1. This is a normal display when the control is in a MaintainTemp mode. No Service Required.1. Pump is not running.2. Low pump pressure.3. Pressure switch fault.1. Water temperature in heater exceeds theinternal limit.2. Limit switch fault.1. Check breakers <strong>and</strong> power source, recheck wiring, s<strong>et</strong> timeclock <strong>and</strong> current time.2. Clean fi lter or clear blockage, check position of valvein plumbing system.3. Adjust or replace pressure switch. Refer to qualifi edservice personnel.1. Verify function of high limit switches. Perform temperaturerise test. Identify <strong>and</strong> correct cause of overheating. Refer toqualifi ed service personnel.2. Identify <strong>and</strong> correct loose connections or replace switches.Refer to qualifi ed service personnel.1. Fusible link fault. 1. Identify <strong>and</strong> correct loose connections or replacefusable link. Refer to qualifi ed service personnel.1. Broken, split, pinched or disconnectedfan/switch tubing.2. Fan not operating.3. Fan running slow or premature fan failure.4. Air fl ow restricted at intake or discharge.5. Oscillating pump pressure.6. Low gas supply pressure.7. No fl ame at burners.1. Faulty wiring or connection.2. Failed sensor.1. Check tubing <strong>and</strong> replace if necessary.2. Correct fault or replace fan. Refer to qualifi ed servicepersonnel.3. Verify proper wiring for 120 VAC or 240 VAC. Refer toqualifi ed service personnel.4. Check for proper clearances around heater <strong>and</strong> foradequate room ventilation if enclosed. Inspect forblockage or restriction at discharge of fl ue. Refer toqualifi ed service personnel.5. Clean fi lter or identify <strong>and</strong> repair cause of pump oscillation.6. Identify <strong>and</strong> repair incorrect supply pipe size or pipe lineblockage.7. Identify <strong>and</strong> correct loose wiring connections, or problemswith igniter, fl ame sensor, gas valve, or ignition control.Refer to qualifi ed service personnel.1. Inspect sensor wiring. Ensure sensor is connected intoPower Interface Board.2. Replace temperature sensor. Refer to qualifi ed servicepersonnel.
<strong>LXi</strong> Pool/Spa Heater Installation <strong>and</strong> Operation Manual Page 43Section 10. ProfessionalMaintenance <strong>and</strong> ServiceWARNINGSERVICING SAFETYSome of the servicing procedures for the <strong>LXi</strong> heaterare hazardous because they involve fuel gas, electricity,moving parts <strong>and</strong> procedures which requir<strong>et</strong>esting or temporary bypass of saf<strong>et</strong>y controls. Forthis reason, the heater must be serviced only by aqualifi ed professional service technician.IMPROPER SERVICE HAZARDThe <strong>LXi</strong> heater incorporates unique design features.Incorrect service of this heater can result in personalinjury or damage to property. To avoid suchhazards, the heater must be serviced only by aqualifi ed professional service technician.AVERTISSEMENTPRÉCAUTIONS LORS DES RÉPARATIONS ETDE L’ENTRETIENCertaines procédures d’entr<strong>et</strong>ien <strong>et</strong> de réparationdes appareils de chauffage à faibles émissions <strong>LXi</strong><strong>et</strong> <strong>LXi</strong> présentent des dangers, car elles m<strong>et</strong>tenten jeu des gaz combustibles, des composantsélectriques, des pièces mobiles <strong>et</strong> des procéduresqui nécessitent des mises à l’essai ou la dérivationtemporaire des comm<strong>and</strong>es de sécurité. Pour c<strong>et</strong>teraison, l’appareil de chauffage doit être entr<strong>et</strong>enu <strong>et</strong>réparé uniquement par un technicien professionnelqualifi é.DANGERS D’UN ENTRETIEN INADÉQUATLes appareils de chauffage à faibles émissionscomportent des caractéristiques techniquesuniques. Une réparation ou un entr<strong>et</strong>ien inadéquatpeut entraîner des blessures corporelles oudes dommages à la propriété. Pour c<strong>et</strong>te raison,l’appareil de chauffage doit être entr<strong>et</strong>enu <strong>et</strong> réparéuniquement par un technicien professionnel qualifi é.10.1 General InformationA qualified professional technician must servic<strong>et</strong>he <strong>LXi</strong> pool heater using <strong>J<strong>and</strong>y</strong>'s service procedures.Before calling for service, however, the owner shouldcheck for obvious problems. The other components inthe pool system, including pump, filters <strong>and</strong> strainers,water valves, gas supply, electrical power <strong>and</strong> timeclocks, have an affect on heater <strong>operation</strong>.Confirm that the heater control is s<strong>et</strong> to eitherPOOL or SPA <strong>and</strong> that the corresponding temperatures<strong>et</strong> point is s<strong>et</strong> high enough to make the heater operate.Make sure the pump is operating, that the filter <strong>and</strong>all bask<strong>et</strong>s are clean, that there are no mis-positionedwater valves, that the gas or electric power supplies arenot shut off <strong>and</strong> that time clocks are properly adjusted.Also be sure that there is no blockage of the exhaustvent grill or rear louvers, which supply combustion airto the burners.10.2 “Premix” Forced-Draft CombustionSystemThe <strong>LXi</strong> pool <strong>and</strong> spa heater has a forced-draftcombustion system incorporating special burners <strong>and</strong> acombustion blower. The burners are of special designin which the combustion air passes through the burners,resulting in a "premix" process. When burningnatural gas, this process produces very little NitrousOxide emissions. Air <strong>and</strong> gas are pushed into theburner venturis where they are mixed <strong>and</strong> conveyedto the combustion chamber. Hot combustion productspass through a highly efficient heat exchanger, wherewater absorbs most of the heat. Exhaust is directed tothe outdoor air through a grill, or for indoor heaters,through vent piping.10.3 Heater Components <strong>and</strong> TheirOperation1. Gas Valve / Regulator - The gas valve controlsgas flow into the manifold. It provides flow onlywhen the temperature control requires heat <strong>and</strong>only if all saf<strong>et</strong>y controls enable <strong>operation</strong>. It isalso a positive pressure regulator. It regulates thegas pressure in the manifold to specifications addressedearlier in this <strong>manual</strong>. This is necessaryfor proper <strong>operation</strong> of the burner system.2. Combustion Blower <strong>and</strong> Air Orifice – Theblower delivers air to the burners. This air isused to combust the fuel. This air is also used topurge the combustion chamber of unburnt fuelbefore ignition <strong>and</strong> after the burners turn off. It isnormal for the fan to start before the main flamestarts <strong>and</strong> to continue operating after the flamehas ceased. The air orifice controls the amount ofair that is delivered to the burners. This orifice isadjustable. The adjustment helps maintain propercombustion. It should be adjusted to specificationsaddressed earlier in this <strong>manual</strong>.3. Temperature Control - The <strong>LXi</strong> heater modelsare equipped with an electronic control whichsenses water temperature by means of a thermistor<strong>and</strong> controls heater <strong>operation</strong> to bring thewater to the temperature selected. It has an optionfor two separate thermostat s<strong>et</strong>tings which ar<strong>et</strong>ypically used to s<strong>et</strong> pool <strong>and</strong> spa temperatures.4. Ignition Control - The ignition control providesenergy for ignition of the air/gas mixture, monitorsthe flame <strong>and</strong> controls the gas valve. Whenthe temperature control calls for heat, the ignition
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