Edition1.2(0608) Page15of 16
Troubleshooting
Symptom SuspectedFault Suggestedremedy
SpannericononinLCD
Internal TZT-701 thermostatFault detected.
CommunicationlossbetweenmainPCBand
wall controllershouldbestronglysuspected.
Call temperzoneservice
Word“FAULT”shownonLCD A/Cfault detected Call temperzoneservice
Airfromthewallcavitymaybeleakingintothe
rearofthethermostat/sensorenclosure. Plugholesinwall withtapetoprevent leaks
Externalheatorcoolsourcesuchaslamps,
televisionsordraftsfromopendoorsaffecting
theaccuracyofsensor.
Movelamps,ventsorothersourcesof
abnormal temperatureawayfromsensors
Temperaturedisplayseemsinaccurate
Sensorcalibrationmaysettingareincorrect Call temperzoneserviceforinformationon
calibratingtheairtemperaturesensor
Cannotenterheatorcoolmodes TZT-701 thermostatsetforHeatingorcooling
onlymodes Heatingorcoolingmodenotavailableon
yourairconditioningsystem
Fansometimesstopsandstarts
intermittentlywhileheatingisrunning Thismaynotbeafault. Youairconditioning
systemmayberunningade-icemaintenance
function.Theindoorfanisturnedoff during
theseeventstopreventdraftsbeingfelt inside
thebuilding
If thisoccurstooften,anairconditioning
fault mayhaveoccurred.
Contact temperzoneforinformationonthis
event
Fanspeedchangesfrequently Thismaynotbeafault YourTZT-701 ischoosingthemost energy
efficientfanspeedforthecurrentconditions.
Tryselectingaspeedmanuallywiththefan
button.
FanOnmodekeepsthefanrunning24
hoursadaywheninprogrammode,orthe
fanstopsshortlyafterheatingstops.
Thisisnot afault. YourTZT-701 advancedfanmanagement
programhasbeencustomisedbyyour
installer.
Checkairconditioningmainfuse ResethomeA/Cfuse
Call temperzoneservice
Wall controllerhasnodisplay
FaultyWiring, fuseorTZT-701 Call temperzoneservice
Heatingandorcoolingtemperaturessetfor
typicaldaytimetemperatures.
Set alowerheat temperatureand/orahigher
coolingtemperature. Reviewmanual on
settingtemperatures
Heating, CoolingorAirConditioning
Systemseemstorunsallnight.
FansettoFanONmode ChangefanmodetoAuto
Heatingorcoolingsystemseemstostart
beforethescheduledstarttime OptimisedStartfunctionmaybeon.
Thisisaninstallersetfunction.
Seeoptimisedstartonpage14 above
Call temperzoneserviceforinformationon
turningthisfunctionoff ifrequired.
Somebuttonsdonot appeartooperate Keyboardlockison.
Seepage14 formoreinformationonthis
function.
Thisisnot afault. Buttonsorfunctionsmay
belockedtoprevent unauthorisedtampering
Specifications
Input Voltage................................................. 24VAC/240VAC(fused)selectable
OperatingTemperature................................. 0-50°C(32 to122F)
OperatingRH................................................. 0-95% (noncondensing)
Size................................................................. 113 x103 x23mm
DisplaySize................................................... 74 x55mm
TempSensors................................................. 10KNTCtype3
Accuracy......................................................... +/-0.3°C@21 C
Displayresolution.......................................... 0.1degC
Control Range................................................ Off to38c
OutsideAirtempdisplayrange..................... -8~+60c
Backlight...................................................... BlueEL
OptimisedStartmethod................................ TimetoStartVs TempDifferentialmethod
CommunicationsProtocol.............................. NativeRS485 -150Mmaxrunwith4corescreenedcable.
WarmStart..................................................... IndoorCoil >33°C.
Fanrun-oninHeatcycle................................ Until IndoorCoil<27°C(Default value.AdjustablebyInstaller)
Fanspeeds....................................................... Basedonevaporatorcoiltemperature
Economyfunction......................................... Available.Seepage5ofInstallerManualfordetails
Approvals....................................................... CE, C-tick