Mitsubishi Electric CAHV-R450YA-HPB Installation & Operation Manual page 54

Error
code *1
Error type
(PCB *2)
Discharge temperature fault
(A discharge refrigerant temperature of 120ºC or
above is detected for 30 seconds while the
1102
compressor is in operation.)
AC61
(A discharge refrigerant temperature of 125ºC or
above is detected momentarily while the
compressor is in operation.)
Heat exchanger freeze up
1503
Inverter Inverter IPM error
error error
4250
Electric
4255
current
4256
related
errors
( 101 )
during
operation
Over current due to current
4250
sensor detection (effective
4255
value) (During operation)
4256
107
( )
Over current due to current
4250
sensor detection (momentary
4255
value) (During operation)
4256
106
( )
Short-circuited IPM/ground
4250
fault
4255
(During operation)
4256
104
( )
Overcurrent error due to a
4250
short-circuited (During
4255
operation)
4256
105
( )
Step-out fault
4255
4256
137
( )
DCL over current error (H/W)
4250
121
( )
128
( )
DCL over current error (S/W)
4250
122
( )
Current IPM error
related
(At startup)
4250
prob-
4255
lems at
4256
start up
( 101 )
Over current due to current
4250
sensor detection (effective
4255
value) (At startup)
4256
107
( )
Over current due to current
4250
sensor detection (momentary
4255
value) (At startup)
4256
106
( )
Cause
(Installation/Setting error)
No water
Abrupt change in water
temperature
(5K/min. or greater)
Pump failure
*6 Drop in water flow or water supply
cutoff during the defrost cycle
Water temperature drop during
defrost cycle
Inter-phase voltage drop
(Inter-phase voltage at or below
180 V)
Motor synchronization loss
DCL overcurrent
54
Cause
(Parts problems)
• High-pressure sensor fault
• Linear expansion valve fault (Main
circuit LEV, injection LEV)
• Refrigerant deficiency (refrigerant
gas leak)
• 4-way valve switching failure
• INV board fault
• Ground fault of the compressor
• Compressor coil problem
• IPM error (loose terminal screws,
cracked due to swelling)
• Fan motor failure
• Fan board failure
• INV board fault
• Ground fault of the compressor
• Compressor coil problem
• IPM error (loose terminal screws,
cracked due to swelling)
• Fan motor failure
• Fan board failure
• Fan motor failure
• Fan board failure
• INV board fault
• Ground fault of the compressor
• Compressor coil problem
• INV board fault
• Ground fault of the compressor
• Compressor coil problem
• IPM error (loose terminal screws,
cracked due to swelling)
• Fan motor failure
• Fan board failure
• INV board fault
• Ground fault of the compressor
• Compressor coil problem
• IPM error (loose terminal screws,
cracked due to swelling)
• Fan motor failure
• Fan board failure
Error reset *3
Unit
Preliminary
side Remote
(PCB)
code
Operation
SWS1
SW
1202
4350
4355
4356
( 101 )
4350
4355
4356
107
( )
4350
4355
4356
106
( )
4350
4355
4356
104
( )
4350
4355
4356
105
( )
4355
4356
137
( )
4350
121
( )
128
( )
4350
122
( )
4350
4355
4356
( 101 )
4350
4355
4356
107
( )
4350
4355
4356
106
( )