Alarm Codes - Hitachi UTOPIA R32 Series Technical Catalogue

11 Troubleshooting

Alarm codes

11.2 Alarm codes
Code Category
Activation of protection device (Float
01 Indoor unit
switch (*))
Activation of protection device (High
02 Outdoor unit pressure cut or High compressor
temperature cut)
Abnormal communication between Indoor
03
units and outdoor units
Communication
Abnormal communication between
04
inverter PCB and Outdoor PCB
05 Supply phase Abnormality of power supply phases
06 Voltage Abnormal inverter voltage
07 Decrease in discharge gas superheat
Cycle
Excessively high discharge gas
08
temperature
Activation of protection device for outdoor
09 Fan motor
fan
Abnormal communication between
0A Communication
outdoor units
0b Incorrect outdoor unit address setting
Outdoor unit
Main unit of the outdoor unit incorrectly
0C
set
11 Abnormality of inlet air thermistor
12 Abnormality of outlet air thermistor
Abnormality of freeze protection
13
thermistor
14 Sensor on Indoor Abnormality of gas piping thermistor
Unit
Abnormality of outdoor air thermistor
15
(Econofresh)
16 Abnormality of remote sensor (DOAS)
Abnormality of thermistor built-in remote
17
Controller (DOAS)
18 Abnormality of indoor fan system
Indoor fan motor
Activation of protection device for indoor
19
fan
Abnormality of fan controller fin
1A
temperature
1b Activation of overcurrent protection
Indoor fan
1C Problem with current sensor
controller
1d Activation fan controller protection
Abnormality of indoor fan controller
1E
voltage
20 Abnormality of the compressor thermistor
21 Abnormality of high pressure sensor
Sensor on
22 Abnormality of outdoor air thermistor
Outdoor Unit
Abnormality of heat exchanger liquid pipe
24
thermistor
120 TCGB0136 rev.1 - 05/2021
Content of Abnormality Leading Cause
Activation of float switch (High water level in drain pan,
abnormality of drain pipe, float switch, or drain pan)
Activation of PSH (pipe clogging, excessive refrigerant, inert
gas mixing) or activation of High temperature compressor
thermostat (shortage of refrigerant or system refrigerant
leakage)
Incorrect wiring, loose terminals, disconnected
communication cable, blowout of fuse, indoor unit power
OFF, Outdoor fuse meltdown
Inverter PCB - outdoor PCB communication failure (loose
connector, wire breaking, blowout of fuse)
Incorrect power supply, open-phase
Outdoor voltage decrease, insufficient power capacity
Excessive refrigerant charge, failure of thermistor, incorrect
wiring, incorrect piping connection, expansion valve locking
at opened position (Disconnect connector)
Insufficient Refrigerant Charge, Pipe Clogging, Failure of
Thermistor, Incorrect Wiring, Incorrect Piping Connection,
Expansion Valve Locking at Closed Position (Disconnect
Connector)
Fan motor overheat, locking
Incorrect wiring, broken cable, loose terminals
Duplication of address setting for outdoor units (Sub units) in
same refrigerant cycle number
Two (or more) outdoor units set as "Main Unit" exist in same
refrigerant cycle number
Incorrect wiring, disconnecting wiring,
breaking wire, short circuit
Abnormality of indoor fan motor (Step-out), indoor fan
controller failure
Fan motor overheat, lockup
Abnormality of fin thermistor or fan controller, heat
exchanger clogging, abnormality of fan motor
Abnormality of fan motor
Abnormality of fan controller current sensor
Driver IC error signal detection, instantaneous overcurrent
Indoor voltage decrease, insufficient capacity of power
supply wiring
Incorrect wiring, disconnecting wiring,
breaking wire, short circuit