Hitachi RPIL-3.0UFE1NH Service Manual page 27

2.TROUBLESHOOTING
Fault
Fault description
code
Indoor EEPROM
74
Data 2 fault
Indoor ambient
81 Temperature
Sensor Fault
Evaporator Middle
83 Temperature
Sensor Fault
Communication
between main
control board &
FE
Wired controller
(254)
Fault (display on
wired controller)
Communication
between main
control board
ER
& display board
Fault (displays on
display board)
Possible reasons f or abnormality
EE in MCU is fails, the unit
can run, but the function user
has set is ineffective.
1. The cable of the room
temperature sensor is connected
loosely;
2. The room temperature sensor
fails;
3. The sampling circuit is abnormal.
1.The cable of the coil temperature
sensor of the evaporator fails;
2.The coil temperature sensor of
the evaporator fails;
3.The sampling circuit is abnormal.
1. The wired controller and the
indoor control board are
connected loosely;
2. The sequence of the wiring
between the wired controller
to the indoor control board is
wrong;
3. The wiring between the
wired controller to the indoor
control board fails;
4. The wired controller fails;
5. The indoor control board
is abnormal.
1.The wiring between the display
board to the indoor control
board is connected loosely;
2.The sequence of the wiring
between the display board to the
indoor control board is wrong;
3.The wiring between the display
board to the indoor control
board fails;
4.The display board fails;
5.The indoor control board fails.
How to deal with
Replace EE data in MCU.
1. Reconnect the cable of the
room temperature sensor;
2. Replace the room temperature
sensor;
3. Replace the indoor control
board.
1. Reconnect the cable of the
coil temperature sensor of the
evaporator;
2. Replace the coil
temperature sensor of the
evaporator;
3. Replace the indoor
control board.
1. Reconnect the wiring between
the wired controller to the
indoor control board;
2. Replace the wiring between
the wired controller to the
indoor control board;
3. Replace the wiring between
the wired controller to the
indoor control board;
4. Replace the wired controller;
5. Replace the indoor control
board.
1. Reconnect the wiring
between the display board
to the indoor control board;
2. Replace the wiring between
the display board to the
indoor control board;
3. Replace the wiring between
the display board to the
indoor control board;
4. Replace the display board;
5. Replace the indoor control
board.
25
Remarks