Rheem RTGH-RH11DV - Chapter 4: Troubleshooting - Cascade Systems; Er:78 Cascade Communication Abnormality

77
Error Meaning Condition
CascadeCommunication
Abnormality
Whentheunitoperatingisstopped,
errorcode78occurred.
Failureevent
Under
‘
Cascadecommunicationfailure
’
,
‘
Setting error
’
,
‘
Back󰘱owoftheExhaustedGas
’
and
‘
Gas Leak
’
,
Er78occurred.
Checkpoint
Chapter4Troubleshooting
①CheckQuickConnectcable.
②Checkthesettingsof12:Cnin
‘
InstallerMode
’
.
③WhenEr40(GasLeak),Er61(Fanerror)orEr67(AGMerror)haveoccurred,Cascade
Communicationerror(Er78)occurstoprotect‘BackFlow’oftheexhaustedgas.
IncaseofEr45(WaterLeak),bothunitsshutdowntominimizethepropertydamageduetoan
internalleak.
④Checkthatoneoftheaboveerrorsisoccurred.
QuickConnectcable