Mitsubishi Electric CAHV-R450YA-HPB Service Manual page 147

[ X Troubleshooting ]
Error type
Discharge temperature fault
(A discharge refrigerant temperature of 120ºC or
above is detected for 30 seconds while the
compressor is in operation.)
(A discharge refrigerant temperature of 125ºC or
above is detected momentarily while the
compressor is in operation.)
Heat exchanger freeze up
Inverter Inverter IPM error
error error
Electric
current
related
errors
during
operation
Over current due to current
sensor detection (effective
value) (During operation)
Over current due to current
sensor detection (momentary
value) (During operation)
Short-circuited IPM/ground
fault
(During operation)
Overcurrent error due to a
short-circuited (During
operation)
Step-out faul
DCL over current error (H/W)
DCL over current error (S/W)
Current IPM error
related
(At startup)
prob-
lems at
start up
Over current due to current
sensor detection (effective
value) (At startup)
Over current due to current
sensor detection (momentary
value) (At startup)
HWE22020
Cause
(Installation/Setting error)
No water
Abrupt change in water
temperature
(5K/min. or greater)
Pump failure
*7 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
- 138 -
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
Error
Preliminary
side Remote
code *1
(PCB)
code
(PCB *2)
Operation
SWS1
1102
1202
AC61
1503
4350 4250
4355 4255
4356 4256
101 101
( ) ( )
4350 4250
4355 4255
4356 4256
107 107
( ) ( )
4350 4250
4355 4255
4356 4256
106 106
( ) ( )
4350 4250
4355 4255
4356 4256
104 104
( ) ( )
4350 4250
4355 4255
4356 4256
105 105
( ) ( )
4355 4255
4356 4256
137 137
( ) ( )
4350 4250
121 121
( ) ( )
128 128
( ) ( )
4350 4250
122 122
( ) ( )
4350 4250
4355 4255
4356 4256
101 101
( ) ( )
4350 4250
4355 4255
4356 4256
107 107
( ) ( )
4350 4250
4355 4255
4356 4256
106 106
( ) ( )
SW
GB