Mitsubishi Electric CAHV-R450YA-HPB Installation & Operation Manual page 55

Error
code *1
Error type
(PCB *2)
Inverter Voltage Bus voltage drop protection
(S/W)
error related
4220
problems
4225
during
4226
operation
108
( )
Bus voltage rise protection
4220
(S/W)
109
( )
Bus voltage error (H/W)
4220
110
( )
Logic error
4220
4225
4226
( 111 )
112
( )
Voltage meter error at start up
(Bus voltage drop protection at start up
4220
(detected by the Main unit side))
4225
4226
( 131 )
Control power supply error
4220
( 129 )
Voltage boost control error
4220
( 123 )
Heatsink fault
4230
(Heatsink overheat protection)
4235
4236
DCL temperature fault
4230
126
( )
Overload protection
4240
4245
4246
ACCT sensor fault
5301
( 115 )
ACCT sensor/circuit fault
5301
117
( )
Open-circuited IPM/loose ACCT sensor
5301
119
( )
Faulty wiring
5301
120
( )
THHS sensor/circuit fault
5110
01 05
( ) ( )
06
( )
DCL electric current circuit error
5301
127
( )
Current sensor fault
5305
5306
135
( )
Cause
(Installation/Setting error)
Momentary power failure/power failure
Power supply voltage drop (Inter-
phase voltage is 248 V or below.)
Voltage drop
Incorrect power supply voltage
VDC error
Malfunction due to external noise
interference
• Faulty grounding
• Improper transmission and
external wiring installation
(Shielded cable is not used.)
• Low-voltage signal wire and
high-voltage wire are in contact.
(Placing the signal wire and
power wire in the same conduit)
Power supply voltage drop
Control power supply failure
• Power supply voltage drop
• Installation condition
Power supply voltage drop (Inter-
phase voltage is 180 V or below.)
Clogged heatsink cooling air
passage
DCL temperature exceeds 150ºC
Short-cycling of air (reduced air
flow)
Clogged heatsink cooling air
passage
Power supply voltage drop (Inter-
phase voltage is 180 V or below.)
55
Cause
(Parts problems)
• INV board fault
• 72C fault
• Noise filter coil (L) fault
• Wiring connections between noise
filter board and INV board fault
• Wiring connections between noise
Fan board and INV board fault
• Resistor (R1, R2) fault
• INV board fault
• INV board fault
• INV board fault
• Fan board fault
• INV board fault
• 72C fault
• Noise filter coil (L) fault
• Wiring connections between noise
filter board and INV board fault
• Wiring connections between noise
Fan board and INV board fault
• Resistor (R1, R2)fault
• INV board, main board fault
• Broken wiring between INV and main
control board
• Contact failure
• INV board fault
• Ground fault of the compressor
• Fan motor fault
• INV and Fan board fault
• THHS sensor fault
• IPM error (loose terminal screws,
cracked due to swelling)
• Contact or connector failure (CNTH)
• INV board fault
• THHS sensor fault
• Fan motor fault
• Current sensor fault
• Compressor fault
• INV and Fan board fault
• INV board fault
• Ground fault of the compressor and
IPM error
• Poor contact at the INV board
connector CNCT2 (ACCT)
• ACCT sensor fault
• Disconnected ACCT sensor (CNCT2)
ACCT sensor fault
• Broken compressor wiring INV circuit
fault (IPM error etc.)
• ACCT sensor is connected in the
wrong phase.
• ACCT sensor is connected in the
wrong orientation.
• THHS sensor contact failure
• THHS sensor fault
• INV board fault
• Contact failure between CNCT1A and
CNCT1B
• INV board fault
• Fan board fault
• Fan motor error
Error reset *3
Unit
Preliminary
side Remote
(PCB)
code
Operation
SWS1
SW
4320
4325
4326
108
( )
4320
109
( )
4320
110
( )
4320
4325
4326
( 111 )
112
( )
4320
4325
4326
( 131 )
4320
( 129 )
4320
( 123 )
4330
4335
4336
4320
126
( )
4320
4325
4326
4301
( 115 )
4300
117
( )
4300
119
( )
4300
120
( )
1214
01 05
( ) ( )
06
( )
4300
127
( )
4305
4306
135
( )