Hitachi UTOPIA R32 Series Installation And Operation Manual page 69

Code Category
01 Indoor Unit
02 Outdoor Unit
03
Communication
04
05 Supply Phase
06 Voltage
07
Cycle
08
0A Communication
0b
Outdoor Unit
Incorrect outdoor unit main unit
0C
11
12
Abnormality of freeze protection
13
14 Sensor on
Indoor Unit
15
16
17 in remote controller (DOAS), not
PMEN0654 rev.0 - 12/2023
Content of Abnormality
Activation of protection device
(float switch)
Activation of protection device
(High pressure cut)
Abnormal communication
between indoor units and
outdoor units
Abnormal communication
between inverter PCB and
outdoor PCB
Abnormality of power supply
phases
Abnormal inverter voltage
Decrease in discharge gas
superheat
Increase in discharge gas
temperature
Abnormal communication
between outdoor units
Incorrect outdoor unit address
setting
setting
Abnormality of inlet air
thermistor
Abnormality of outlet air
thermistor
thermistor
Abnormality of gas piping
thermistor
Abnormality of outdoor air
thermistor (EconoFresh)
Abnormality of remote sensor
(DOAS), not for EU market
Abnormality of thermistor built-
for EU market
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)
Incorrect wiring, loose terminals, disconnected
communication cable, blowout of fuse, indoor unit Power
OFF
Inverter PCB - outdoor PCB communication failure (loose
connector, wire breaking, blowout of fuse)
Incorrect power supply, connection to reversed phase,
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)
Incorrect wiring, breaking wire, 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
DOAS: Dedicated outdoor air system, all fresh air indoor
unit
14
60