Hitachi UTOPIA R32 Series - 14.2 Main Alarm Codes

60
PMEN0654 rev.0 - 12/2023
14
MAIN ALARM CODES
TROUBLESHOOTING
Code Category Content of Abnormality Leading Cause
01 Indoor Unit
Acvaon of protecon device
(oat switch)
Acvaon of oat switch (high water level in drain pan,
abnormality of drain pipe, oat switch, or drain pan)
02 Outdoor Unit
Acvaon of protecon device
(High pressure cut)
Acvaon of PSH (pipe clogging, excessive refrigerant,
inert gas mixing)
03
Communicaon
Abnormal communicaon
between indoor units and
outdoor units
Incorrect wiring, loose terminals, disconnected
communicaon cable, blowout of fuse, indoor unit Power
OFF
04
Abnormal communicaon
between inverter PCB and
outdoor PCB
Inverter PCB - outdoor PCB communicaon failure (loose
connector, wire breaking, blowout of fuse)
05 Supply Phase
Abnormality of power supply
phases
Incorrect power supply, connecon to reversed phase,
Open-phase
06 Voltage Abnormal inverter voltage Outdoor voltage decrease, insucient power capacity
07
Cycle
Decrease in discharge gas
superheat
Excessive refrigerant charge, failure of thermistor,
incorrect wiring, incorrect piping connecon, expansion
valve locking at opened posion (disconnect connector)
08
Increase in discharge gas
temperature
Insucient refrigerant charge, pipe clogging, failure of
thermistor, incorrect wiring, incorrect piping connecon,
expansion valve locking at closed posion (disconnect
connector)
0A Communicaon
Abnormal communicaon
between outdoor units
Incorrect wiring, breaking wire, loose terminals
0b
Outdoor Unit
Incorrect outdoor unit address
seng
Duplicaon of address seng for outdoor units (sub
units) in same refrigerant cycle number
0C
Incorrect outdoor unit main unit
seng
Two (or more) outdoor units set as "main unit" exist in
same refrigerant cycle number
11
Sensor on
Indoor Unit
Abnormality of inlet air
thermistor
Incorrect wiring, disconnecng wiring, breaking wire,
short circuit
DOAS: Dedicated outdoor air system, all fresh air indoor
unit
12
Abnormality of outlet air
thermistor
13
Abnormality of freeze protecon
thermistor
14
Abnormality of gas piping
thermistor
15
Abnormality of outdoor air
thermistor (EconoFresh)
16
Abnormality of remote sensor
(DOAS), not for EU market
17
Abnormality of thermistor built-
in remote controller (DOAS), not
for EU market