
146
11. Service and Maintenance
Error
codes
Appearance, Portion, Parts
seemed wrong
Method of check
Troubleshooting
Figure/
Table
Error
reset
L8
Room temp.
(Master
Remote
controller) error
Sensor,Temp.Room
(Master Remote
controller)
Master Remote controller should be
replaced
Auto
L9
Room temp.
(Slave Remote
controller) error
Sensor,Temp.Room
(Slave Remote
controller)
Slave Remote controller should be
replaced
LC
Anti Legionella
Function
Not completed
DHW used during Anti
Legionella
Check if DHW used during Anti
Legionella
Restart operation, don't use much
DHW during Anti Legionella
Auto(*3)
Manual
Clogged the water
pump and/or water
circuit
Check the pump and the water
circuit
Remove any obstructions, clean the
water filter, unblock the pump
Heat source setting
failure
Check parameter and heat
source
After correcting parameter settings or
replace heat source
740
Master Remote
controller
communication
error
・
Incorrect Master
Remote controller
wiring or Dip SW
setting
・
Loose interface
connection cable or
contacts
Check loose cable connections
and contacts
Check Dip SW setting
(Back side of Remote
controller)
After having corrected the wiring and
Dip SW setting, restart operation
Auto
Master Remote
controller
Other than described above
Master Remote controller should be
replaced
PCB(Controller)
Other than described above
PCB(Controller) should be replaced
750
Slave Remote
controller
communication
error
・
Incorrect Slave
Remote controller
wiring or Dip SW
setting
・
Loose interface
connection cable or
contacts
Check loose cable connections
and contacts
Check Dip SW setting
(Back side of Remote
controller)
After having corrected the wiring and
Dip SW setting, restart operation
Auto
Slave Remote
controller
Other than described above
Slave Remote controller should be
replaced
PCB(Controller)
Other than described above
PCB(Controller) should be replaced
E8
Remote control-
ler communica-
tion error
・
Incorrect Remote
controller wiring
・
Loose interface
connection cable or
contacts
Check loose cable connections
and contacts
After having corrected the wiring,
restart operation
Master or Slave
Remote controller
Other than described above
Master or Slave Remote controller
should be replaced
PCB(Controller)
Other than described above
PCB(Controller) should be replaced
F5
PCB (Main)
Communication
error
・
Incorrect PCB(Main)
wiring
・
Loose interface
connection cable or
contacts
Check loose cable connections
and contacts
After having corrected the wiring,
restart operation
PCB(Main)
Other than described above
PCB(Main) should be replaced
PCB(Controller)
Other than described above
PCB(Controller) should be replaced
PCB(Terminal) can't be
operated
PCB(Terminal) doesn't
display
anything
Lead wire of
PCB(Terminal)
Check lead wires are
connected to the connectors
properly
Connect the connectors to both
PCB(Terminal) and PCB(Controller)
steadily
Ensure that there is no
disconnection for the lead
wires
Lead wires should be replaced
PCB(Terminal)
Other than described above
PCB(Terminal) should be replaced
PCB(Controller)
Other than described above
PCB(Controller) should be replaced
(*3) When Anti Legionella Function has been completed, alarm display will reset automatically.
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