Code
number
Category
Type of abnormality
Main cause
7
Cycle
Decrease in discharge gas superheat
Excessive Refrigerant Charge, Failure of Thermistor, Incorrect
Wiring, Incorrect Piping Connection, Expansion Valve Locking at
Opened Position (Disconnected Connector).
8
Excessively high discharge gas temperature at
the top of compressor
Insufficient refrigerant charge, refrigerant leakage. Expansion valve
closed or clogged.
19
Fan motor
Activation of the protection device for the indoor
fan motor
Failure of fan motor.
20
Outdoor unit
sensor
Thermistor for discharge gas temperature
(THM9)
Incorrect wiring, disconnected wiring, broken cable, short circuit.
21
High pressure sensor
22
Thermistor for outdoor ambient temperature
(THM7)
24
Thermistor for evaporating temperature (THM8)
Incorrect Wiring, Disconnected Wiring, Wire Breaking, Short
Circuit, Fan Motor Locking at Heating Operation.
31
System
Incorrect capacity setting or combined capacity
between outdoor and indoor units
Incorrect Capacity Code Setting, Excessive or Insufficient Indoor
Unit Total Capacity Code.
35
Incorrect indoor unit number setting
Duplication of indoor unit number, number of indoor units over
specifications.
36
Incorrect of Indoor Unit Combination.
38
Abnormality of picking up circuit for protection
(Outdoor unit)
Failure of indoor unit PCB, incorrect wiring, connection to PCB in
indoor unit.
45
Protection
device
Activation of the safety device from excessively
high discharge pressure
Overload (obstruction of HEX, short circuit) mixture of inert gas,
Excessive Refrigerant.
47
Activation of the safety device from excessively
low suction pressure (protection from vacuum
operation)
Shortage or leakage of refrigerant, piping clogging, expansion
valve close-locked, fan motor locked.
48
Activation of overcurrent protection
Overload, overcurrent. Failure of Inverter PCB, heat exchanger
clogged, locked compressor. EVI/EVO failure.
51
Inverter
Abnormal operation of the current sensor
Incorrect wiring of current sensor. Failure of control PCB or Inverter
PCB.
53
Inverter fin temperature increase
Inverter module (IPM, DIP-IPM) and Inverter PCB abnormality.
Failure of compressor, clogging of heat exchanger.
54
Abnormality of inverter fin temperature
Heat Exchanger Clogging. Fan Motor Failure.
55
Abnormality of inverter module
Failure of DIP-IPM, IPM or Inverter PCB.
EE
Compressor
Compressor protection
"Compressor failure. This alarm code appears when the following
alarms 02, 07, 08, 45, 47 occur three times within 6 hours."
b0
Indoor unit
model setting
Incorrect setting of unit model
No setting of unit capacity or incorrect setting of unit capacity.
b1
Number setting
Incorrect setting address or refrigerant cycle
Over 64 indoor units setting by number or indoor unit address.
b5
Incorrect setting of indoor unit number for
H-LINK type
The number of indoor units connected to the H-LINK II of one
system is 17 or higher.
12.1.4 Alarms for LCD
Alarm
Code
Retry
Stop
Code
YUTAKI
S/SC
YUTAKI
S80
YUTAKI
M
Origin
Detail of Abnormality
Main Factors
202
(o)
(o)
(o)
LCD
Wrong settings of PC-ARFH1E
203
(o)
(o)
(o)
LCD
Slave PC-ARFH1E stops answering
to Master PC-ARFH1E
Loose, disconnected, broken or
short-circuited connector
204
(o)
(o)
(o)
LCD
Indoor unit stops answering to
Master PC-ARFH1E
Loose, disconnected, broken or
short-circuited connector
205
(o)
(o)
(o)
LCD
Central Alarm, no Central message
Loose, disconnected, broken or
short-circuited connector
TROUBLESHOOTING
PMML0575 rev.2 - 03/2022
318
