10 Troubleshooting
Troubleshooting procedure
SMGB0091 rev.2 - 11/2015
198
Code
number
Category
Type of abnormality
Main cause
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 or faulty RASC fan
motor.
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, RASC 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) and Inverter PCB abnormality.
Failure of compressor, clogging of heat exchanger.
54
Abnormality of inverter fin temperature
Abnormal inverter fin thermistor or Heat exchanger
clogged.
55
Abnormality of inverter PCB
Failure of 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.