Hitachi UTOPIA RAS-4HVRP2E - Alarm Codes for the Outdoor Units; Ras-3 Hvrc2; Troubleshooting Procedure

10 Troubleshooting
Troubleshooting procedure
SMGB0136 rev.0 - 07/2021
234
10.2 Troubleshooting procedure
10.2.1 RAS-3HVRC2
10.2.1.1 Alarm codes for the outdoor units
Alarm
code
Retry
stop
code
Origin Detail of Abnormality Main Factors
02 –
Outdoor
Unit
Activation of protection device (high
pressure cut)
Activation of PSH, locked motor, abnormal operation in the
power supply phase.
Failureoffanmotor,draindischarge,PCB,relay,oatswitch
activated.
(Pipe clogging, excessive refrigerant, innert gas mixing, fan
motor locking at cooling operation)
03 –
Transmission
Transmission Alarm (Not outdoor unit
detected)
Loose, disconnected, broken or short-circuited connector
04 –
Abnormal transmission between inverter
PCB and RASC unit PCB
Transmission failure between inverter PCBs. (Loose
Connector, Wire Breaking, Blowout of Fuse).
05 –
Power
supply
Reception of abnormal operation code
for detection of power source phase
Power source with abnormal wave pattern. Main power supply
phase is reversely connected or one phase is not connected.
06 – Voltage
Excessively low voltage or excessively
high voltage for the inverter
Voltagedropinpowersupply.Incorrectwiringorinsufcient
capacity of power supply wiring.
07 –
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).
08 –
Excessively high discharge gas
temperature at the top of compressor
Insufcientrefrigerantcharge,refrigerantleakage.Expansion
valve closed or clogged.
20 –
OU sensor
Thermistor for discharge gas
temperature (THM9)
Incorrect wiring, disconnected wiring, broken cable, short
circuit.
22 –
Thermistor for outdoor ambient
temperature (THM7)
24 – OU sensor
Thermistor for evaporation or
condensation temperature (THM8 /
THM10)
Incorrect wiring, disconnected wiring, broken cable, short
circuit.
31 –
System
Incorrect capacity setting or combined
capacity between outdoor and indoor
units
IncorrectCapacityCodeSetting,ExcessiveorInsufcient
Indoor Unit Total Capacity Code.
35 – Incorrect indoor unit number setting
Duplication of indoor unit number, number of indoor units over
specications.
36 –
Incorrect indoor unit combination
38 –
Abnormality at picking up circuit for
protection (OU)
Failure of indoor unit PCB, incorrect wiring, connection to PCB
in indoor unit.
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ntemperatureincrease
Inverter module (IPM, DIP-IPM) and Inverter PCB abnormality.
Failure of compressor, clogging of heat exchanger.
54 –
Abnormalityofinverterntemperature
Heat Exchanger Clogging. Fan Motor Failure.
55 –
Abnormality of inverter module
Failure of DIP-IPM, IPM or Inverter PCB.
57 – Outdoor
Fan motor protection
Abnormality of fan motor protection (DC fan motor)
5b – Outdoor fan Activation of over current protection Fan consumption abnormality
5c – Outdoor fan Abnormality in current detection circuit Abnormality in fan current detection circuit
EE –
Compres-
sor
Compressor protection
"Compressor failure. This alarm code appears when the
following alarms: 02, 07, 08, 45, 47 occur three times within 6
hours."