Fault Codes - Hitachi RPIL-1.0PNN1DH Service Manual

2. TROUBLESHOOTING

2.2 Fault codes

The following is the fault code table of outdoor units.
Fault
Fault description
code
Outdoor ambient
1 temperature sensor
fault
Outdoor coil
2 temperature sensor
fault
The unit over-current
3
turn off fault
4 EEprom Data error
Cooling freezing
protection (the indoor
coil temperature is too
5 low) or heating
overload (indoor coil
temperature is too
high)
The communication
fault between the
7
indoor unit and
outdoor unit
Table 1 Outdoor fault code
Possible reasons for abnormality
1.The outdoor ambient temperature
sensor is connected loosely;
2.The outdoor ambient temperature
sensor fails to work;
3.The sampling circuit fails.
1.The outdoor coil temperature
sensor is connected loosely;
2.The outdoor coil temperature
sensor fails to work;
3.The sampling circuit fails.
1. Control board current sampling
circuit fails;
2. The current is over high because
the supply voltage is too low;
3. The compressor is blocked;
4. Overload in cooling mode;
5. Overload in heating mode.
1.EE components fails;
2.EE components control circuit
fails;
3.EE components are inserted
incorrectly.
1.The indoor unit can not blow air
normally;
2.The room temperature is too low in
cooling mode or the room
temperature is too high in heating;
3.The filter is dirty;
4.The duct resistance is too high to
result in low air flow;
5.The setting fan speed is too low;
6.The indoor unit is not installed in
accordance with the installation
standards, and the air inlet is too
close to the air outlet .
1.The connection cable is connected
improperly between the indoor unit
and outdoor unit;
2.The communication cable is
connected loosely;
3.The communication cable fails;
4.The indoor control board fails;
5.The outdoor control board fails;
6.Communication circuit fuse open;
7.The specification of
communication cable is incorrect.
How to deal with
1.Reconnect the outdoor
ambient temperature sensor;
2.Replace the outdoor ambient
temperature sensor
components;
3.Replace the outdoor control
board components.
1.Reconnect the outdoor coil
temperature sensor;
2.Replace the outdoor coil
temperature sensor
components;
3.Replace the outdoor control
board components.
1. Replace the electrical control
board components;
2. Normal protection;
3. Replace the compressor;
4. Please see NOTE 3;
5. Please see NOTE 4.
1.Replace the EE components;
2.Replace the outdoor control
board components;
3.Reassemble the EE
components.
1.Check whether the indoor fan,
indoor fan motor and
evaporator work normally;
2.Normal protection;
3.Clean the filter;
4.Check the volume control
valve, duct length etc.;
5.Set the speed with high speed;
6.Reinstall the indoor unit
referring to the user manual to
change the distance between
the indoor unit and the wall or
ceiling.
1.Reconnect the connection
cable referring to the wiring
diagram;
2. Reconnect the communication
cable;
3. Replace the communication
cable;
4.Replace the indoor control
board;
5.Replace the outdoor control
board;
6.Check the communication
circuit, adjust the DIP switch
and the short-circuit fuse.
7.Choose suitable
communication cable
referring to the user manual
23
Remarks