Specifications

TroubleshootingGuide
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21|Page
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ERRORCODE721:FALSEFLAMEDETECTION 
1) Firstandforemost,shutoffallgasandpowertotheunit.Theproblemcouldbetheflamesensor,
butifitisn’t,thisisaverydangeroussituation.
2) Contactthetechnicalservicedepartmentforfurtherassistance.
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ERRORCODE741:MAINREMOTECONTROL PROBLEM
Thiserrorcodeonlyoccurswhenthereisamiscommunicationbetweenthetemperatureremote
controllerandwaterheater.
1) CheckthatallwiringisproperlyconnectedtotheTM‐RE10orTM‐RE30.
2) VerifythatonlyasingleTM‐RE10orTM‐RE30isinstalled.Anincorrect remoteormultiple
remotes
willresultinthiserrorcode.IftheTK‐RE02isinstalle d,code74willflash.
3) Ifyoudisconnecttheremotefromtheheaterwiththepowersupplyon,thiserrorcodewillresult.
Turnoffpowerbeforedisconnectingtheremotefromtheheater.
4) Checkforany
signsofpowersurges.
ERRORCODE761:COMMUNICATIONFAILURE
1) Thiserrorcodeonlyoccursinamultipleheatersetup,wherethereisamiscommunicationbetween
masterandslaveunitsforEasy‐Linksystems.
2) Thiserrorcodewillonlybedisplayedonthemasterheater.
3) Thiserrorindicatesthatthemasterunithaslostcommunicationwiththeindicated
heater.
4) Verifythatthereispowertotheunitthathaslostcommunication.
5) SeetheInstallationManualforpropercommunicationcablesetup.
6) Checkforsignsofpowersurges.
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ERRORCODE941:ABNORMALEXHAUSTTEMPERATURE
1) Checkforexcessiveventlengthandforanyblockageintheintakeairand/orexhaust.
2) Checkfordustorlintintheburnerandheatexchangerincontaminatedinstallationareas.
3) Checkthemanifoldpressure.
4) Theexhaustfanmotormaynotbefunctioningproperly.
5) Iftheunit
settemperatureisabove140Fandisin arecirculationsystem,contactthetechnical
servicedepartmentforasolution.
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ERRORCODE991:ABNORMALCOMBUSTION
1) Refertoerrorcode101.
2) Contactthetechnicalservicedepartmentforfurtherassistanceifnothinghasworkedsofar.The
manifoldgaspressuremayneedadjustment.
3) Ifyouaresurethattheproblemhasbeensolved,resetthecomputerboard(p.26).
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