Section 11: Fault FindingPage 54
11.5 Table of Controller PCB and Terminal PCB Alarms
Error
code
Error Method of check Troubleshooting
Figure/
table
Error
reset
L0 EEPROM error
PCB(Controller)
and
PCB(EEPROM)
-
PCB(Controller) and PCB(EEPROM)
should be replaced
-
Power
OFF
L1
DHW temperature
sensor error
Sensor,
temperature
DHW tank
Check the resistance by tester
If the sensor is faulty, it should be
replaced
Figure
11-14
Auto
L2
Outdoor
temperature
sensor error
Sensor,
temperature
outdoor
Check the resistance by tester
If the sensor is faulty, it should be
replaced
Figure
11-16
L3
Thermal store
temperature
sensor error
Sensor,
temperature
thermal store
Check the resistance by tester
If the sensor is faulty, it should be
replaced
Figure
11-14
L4
Mix water
temperature
sensor error
Sensor,
temperature
Mix water
Check the resistance by tester
If the sensor is faulty, it should be
replaced
Figure
11-14
L5
Humidity sensor
error
Sensor, Humidity Check the resistance by tester
If the sensor is faulty, it should be
replaced
Figure
11-11
740
Remote controller
communication
error
Incorrect remote
controller wiring or
DIP SW setting
Check loose cable connections and
contacts
Check DIP SW setting
After having corrected the wiring and DIP
SW setting, restart operation
-
Loose interface
connection cable
or contacts
Rear side of remote controller
Remote controller Other than described above Remote controller should be replaced
Controller PCB Other than described above Controller PCB should be replaced
E8
Remote controller
communication
error
Incorrect remote
controller wiring
Loose interface
connection cable
or contacts
Check loose cable connections and
contacts
After having corrected the wiring, restart
operation
-
Controller PCB Other than described above Controller PCB should be replaced
F5
Main PCB
communication
error
Incorrect main
PCB wiring
Loose interface
connection cable
or contacts
Check loose cable connections and
contacts
After having corrected the wiring, restart
operation
-
Main PCB Other than described above Main PCB should be replaced
Controller PCB Other than described above Controller PCB should be replaced
Terminal PCB cannot be
operated
Terminal PCB does not
display anything
Lead wire of
Terminal PCB
Check lead wires are connected to the
connectors properly
Connect the connectors to both Terminal
PCB and Controller PCB steadily
- -
Ensure that there is no disconnection for
the lead wires
Lead wires should be replaced
Terminal PCB Other than described above Terminal PCB should be replaced
Controller PCB Other than described above Controller PCB should be replaced
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