Hitachi FSXN Series Service Manual page 175

8 Troubleshooting
Code Category
21 High pressure sensor
22 Outdoor air thermistor
23 Discharge gas thermistor at top of compressor
Outdoor unit
sensor
24 Heat exchanger liquid pipe thermistor
25 Heat exchanger gas pipe thermistor
29 Low pressure sensor
31 Incorrect capacity setting on outdoor and indoor units
35 System Indoor unit no. incorrectly set
Abnormality in the collection circuit for outdoor unit
38
protection
Abnormal operation current in constant speed
39 Compressor
compressor
3A Abnormal outdoor unit capacity.
Voltage or combination of outdoor unit models
3b
Outdoor unit incorrectly set
Abnormal transmission between the main unit and the
3d
secondary unit(s)
43 Low-pressure decrease protection device activation
44 Low-pressure increase protection device activation
Protection device
45 High pressure increase protection device activation
Low-pressure decrease protection device activation
47
(vacuum protection)
48 Inverter overcurrent protection device activation
51 Sensor Abnormal inverter current sensor
53 Inverter error signal detection
Inverter
54 Abnormal inverter fin temperature
55 Inverter fault
57 Fan controller protection activation
5A Abnormal fan controller fin temperature
Fan controller
5b Overcurrent protection activation
5C Abnormal fan controller sensor
Compressor protection alarm (cannot be reset from the
EE Compressor
remote controller)
Outdoor unit Unit number or address number of the outdoor unit
b1
number setting incorrectly set
Indoor unit
b5 Connection number of the indoor unit incorrectly set
number setting
C1 Incorrect indoor unit connection
C2 CH unit Connection number of the indoor unit incorrectly set
C3 Incorrect indoor unit connection
169
SMGB0065 rev. 1 - 12/2010
Content of abnormality Possible cause
Incorrect wiring, disconnected wiring, broken cable, short
circuit.
Combination capacity incorrectly set. Excessive or insufficient
total indoor unit capacity.
Indoor unit no. duplicated in same reference group.
Protection detection device fault (incorrect wiring of outdoor
PCB).
Overcurrent, blown fuse, current sensor fault, instant power
failure, voltage drop, abnormal power supply.
Outdoor unit capacity >54 HP.
Voltage or combination of secondary and main units incorrectly
set.
Incorrect wiring, disconnected wiring, broken cable, PCB fault.
Defective compression (compressor or inverter fault, loose
power supply connection).
Overload during cooling, high temperature with heating, locked
expansion valve (loose connector).
Overload (clogging, short pitch), pipe clogging, excess
refrigerant, mixture of inert gas.
Insufficient refrigerant, refrigerant pipes, clogging, expansion
valve locked in open position (loose connector).
Overload, compressor fault.
Current sensor fault.
Controller IC error signal detection (overcurrent, low-voltage
and short-circuit protection).
Abnormal inverter fin thermistor, heat exchanger clogging, fan
motor fault.
Inverter PCB fault.
Controller IC error signal detection (overcurrent, low-voltage
and short-circuit protection), instant overcurrent.
Fin thermistor fault, heat exchanger clogging, fan motor fault.
Fan motor fault.
Current sensor fault (instant overcurrent, increased fin
temperature, low voltage, earthing fault, step-out).
This alarm code is displayed when the following alarms are
triggered three times within six hours: 02, 07, 08, 39, 43 to 45,
47.
A number greater than 64 has been set for the refrigerant cycle
or address.
There are more than 17 units not corresponding to H-LINK II
connected to one system.
There are 2 or more CH units connected between the outdoor
and indoor units.
There are 9 or more indoor units connected to the CH unit
Indoor units from different refrigerant cycles have been
connected to the CH unit.
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