Hitachi RPIL-1.0PNN1DH Service Manual page 30

2. TROUBLESHOOTING
NOTE 1:
If the indoor unit can not start or the indoor unit stops itself after 30s, at the same time the unit do
not display the fault code, please check the fire and the socket of the control board.
NOTE 2:
If the indoor unit displays the 75,76,77,78 fault code after you turn on the unit, please check the
TEST seat of the indoor control board or the TEST detection circuit to see whether short circuit
occurs.
NOTE 3: Overload in cooling mode
sr.
1 The refrigerant is excessive.
2 The outdoor ambient temperature is too high.
Short-circuit occurs in the air outlet and air inlet of
3
the outdoor unit.
The outdoor heat exchanger is dirty, such
4
as condenser.
5 The speed of the outdoor fan motor is too low.
The outdoor fan is broken or the outdoor fan
6
is blocked.
7 The air inlet and outlet have been blocked.
8 The expansion valve or the capillary fails.
NOTE 4: Over load in heating mode
sr.
1 The refrigerant is excessive.
2 The indoor ambient temperature is too high.
Short-circuit occurs in the air outlet and air
3
inlet of the indoor unit.
4 The indoor filter is dirty.
5 The speed of the indoor fan motor is too low.
The indoor fan is broken or the outdoor fan
6
is blocked.
7 The air inlet and outlet have been blocked.
8 The expansion valve or the capillary fails.
Overload in cooling mode
The root cause
Overload in heating mode
The root cause
Corrective measure
Discharge the refrigerant, and recharge
the refrigerant referring to the rating label.
Please use it within allowable temperature range
Adjust the installation of the outdoor unit
referring to the user manual.
Clean the heat exchanger of the outdoor unit,
such as condenser.
Check the outdoor fan motor and fan capacitor.
Check the outdoor fan.
Remove the obstacles.
Replace the expansion valve or the capillary.
Corrective measure
Discharge the refrigerant, and recharge
the refrigerant referring to the rating label.
Please use within allowable temperature range.
Adjust the installation of the indoor unit referring
to the user manual.
Clean the indoor filter.
Check the indoor fan motor and fan capacitor.
Check the indoor fan.
Remove the obstacles.
Replace the expansion valve or the capillary.
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