ONHW30NG60 User Manual

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Page41

Version1.0Aug2018

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Problem PossibleCauses Solution

Watertemperatureistoohot.



1. Water heater temperature

settingistoohigh.

1. Lower the water heater

temperaturesetting.

2. Water service valve is not

completelyopened.

2. Check and open completely

thewaterservicevalve.

3. Wateroutletflowistoolow. 3. Increasethewateroutlet

flowrate.

4. Strainerisblocked. 4. Cleanstrainer.

Fan continues to operate after water

outletisoff.

The post purge cycle is clearing

fluegas.

Normaloperation.



ONSENwaterheaterhasabuilt‐inelectronicdiagnosticsystem.Whenanerroroccurs,theremotecontrolwillshow

theerrorcode.Refertotheerrorcodesfoundbelowandpossiblefaultsforfurtherinformation. 



Whenanerrorcodeisshown,turnOFFallhotwateroutlets.TurnOFFthewaterheaterbypressingPowerON/OFF

ontheremotecontrol.Waitforabout5minutes,thenrestartthewaterheateragainbypressingPowerON/OFFon

theremotecontrol.Turnonahotwateroutletandrecheckthedisplaytodetermineifthereisstillanerror.



Iferrorstillexists,turnoffthehotwateroutletandwaterheater.Unplugthepowersupply,waitfor30secondsand

reconnectit.Restartthehotwaterheaterandturnonahotwateroutlettocheckagain. 



Ifthereisstillerrorshowninthedisplay,takeanoteofthedisplayederrorandturnOFFthewaterheater.Contact

authorisedservicecentreforservicing. 



ErrorCode

Faults

 01 Watersupplytemperaturecircuit 

 10 Flamedetectionmalfunction

 11 Ignitionfailure

 12 Unexpectedflameout

 13   Thermostatcircuiterror

 30   Fluepressuresignalinitialdetectionfailure

 31  Fluepressurepretestmalfunction

 32 Flueblockageerror

 34 Pretestmalfuctionforfanblockage

 35 Fanblockageerror

Figure 48

Figure 49

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User Manual - Page 42