Hitachi RPI-0.8FSN4E - TEST RUN CHECK LIST; ALARM CODES

12 ALARM CODES
Most common alarm codes
Code Category Content of abnormality Possible cause
01 Indoor unit
Protection device activation (oat switch)
Float switch activation (high water level in drain hose or
abnormality in drain pipe, oat switch or drain pan).
02 Outdoor unit
Protection device activation (disconnection due to
high pressure)
PSH activation (pipe clogging, excess refrigerant, mix-
ture of inert gas).
03
Transmission
Abnormality between indoor and outdoor
Incorrect wiring, loose terminals, disconnect cable,
blown fuse, outdoor unit switched off.
04
Abnormality between inverter PCB and outdoor
PCB
Inverter PCB - Outdoor PCB transmission fault (loose
connector, broken cable, blown fuse).
04.
Abnormality between fan controller and outdoor
PCB
Fan controller - Outdoor PCB transmission fault (loose
connector, broken cable, blown fuse).
05 Power phase
Abnormality in the power phases
Incorrect power supply, inverted phase connection, open
phase.
06
Voltage
Abnormal inverter voltage Outdoor voltage drop, insufcient power.
06.
Abnormal fan controller voltage Outdoor voltage drop, insufcient power.
07
Cycle
Drop in discharge gas superheat
Excessive refrigerant charge, thermistor fault, incor-
rect wiring, incorrect pipe connection, expansion valve
locked in open position (connector disconnected).
08
Increase in discharge gas temperature
Insufcient refrigerant charge, pipe clogging, thermistor
fault, incorrect wiring, incorrect pipe connection, expan-
sion valve locked in closed position (connector discon-
nected).
0A Transmission
Abnormality between outdoor and indoor Incorrect wiring, broken cable, loose terminals.
0b
Outdoor unit
Incorrect outdoor unit address setting
Duplicate address setting of outdoor units (secondary
units) in the same refrigerant cycle system.
0C
Main unit of the outdoor unit incorrectly set
Two (or more) outdoor units dened as the “main unit” in
the same refrigerant cycle system.
11
Indoor unit sensor
Air inlet thermistor
Incorrect wiring, disconnected wiring, broken cable,
short circuit.
12
Air outlet thermistor
13
Frost protection thermistor
14
Gas pipe thermistor
19 Fan motor
Indoor fan protection device activation Fan motor overheating, locking.
21
Outdoor unit
sensor
High pressure sensor
Incorrect wiring, disconnected wiring, broken cable,
short circuit.
22
Outdoor air thermistor
23
Discharge gas thermistor at top of compressor
24
Heat exchanger liquid pipe thermistor
25
Heat exchanger gas pipe thermistor
29
Low pressure sensor
31
System
Incorrect capacity setting on outdoor and indoor
units
Combination capacity incorrectly set. Excessive or insuf-
cient total indoor unit capacity.
35
Indoor unit no. incorrectly set Indoor unit no. duplicated in same reference group.
36
Incorrect of indoor unit combination
Duplication of indoor unit number in same refrigerant
group.
38
Abnormality in the collection circuit for outdoor
unit protection
Protection detection device fault (incorrect wiring of
outdoor PCB).
39 Compressor
Abnormal operation current in constant speed
compressor
Overcurrent, blown fuse, current sensor fault, instant
power failure, voltage drop, abnormal power supply.
71
PMML0294A rev.2 - 07/2014
Alarm codes
ENGLISH
PMML0294A_rev.2_02-2014.indb 71 14/07/2014 12:28:40