Mitsubishi Electric CAHV-P500YA-HPB Instruction Manual page 10

Error
code *1
(PCB *2)
Heat exchanger freeze up
1104
Inverter Electric IPM error
error current
4250
related
4255
errors
101
( )
during
opera-
tion
4250
ACCT overcurrent
4255
102
( )
4250
DCCT overcurrent
4255
103
( )
4250
Overcurrent relay trip (effective value)
4255
(During operation)
107
( )
4250
Overcurrent relay trip (momentary value)
4255
(During operation)
106
( )
4250
Short-circuited IPM/ground fault
4255
(During operation)
104
( )
4250
Overcurrent error due to a short-circuited
4255
(During operation)
105
( )
Current- IPM error
related (At startup)
4250
pro-
4255
blems
101
( )
at start
up
4250
ACCT overcurrent
4255
(At startup)
102
( )
4250 DCCT overcurrent
4255
(At startup)
103
( )
4250
Overcurrent relay trip (effective value)
4255
(At startup)
107
( )
4250
Overcurrent relay trip (momentary value)
4255
(At startup)
106
( )
Voltage- Bus voltage drop protection
4220
related
4225
pro-
108
( )
blems
during
4220
Bus voltage rise protection
opera-
4225
tion
109
( )
Logic error
4220
4225
111
( )
4220
Voltage meter error at start up
4225
(Bus voltage drop protection at start up (detected
131
( )
by the Main unit side))
Heatsink fault
(Heatsink overheat protection)
4230
4235
Overload protection
4240
4245
5301
ACCT sensor fault
5305
115
( )
Error type
*6 Drop in water flow or water supply cutoff
Cause
(Installation/Setting error)
during the defrost cycle
Water temperature drop during defrost cycle
Inter-phase voltage drop
(Inter-phase voltage at or below 180 V)
Momentary power failure/power failure
Power supply voltage drop (Inter-phase
voltage is 180 V or below.)
Voltage drop
Incorrect power supply voltage
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
Power supply voltage drop (Inter-phase
voltage is 180 V or below.)
Clogged heatsink cooling air passage
Short-cycling of air (reduced air flow)
Clogged heatsink cooling air passage
Power supply voltage drop (Inter-phase
voltage is 180 V or below.)
10/20
Cause
(Parts problems)
• 4-way valve switching failure
• INV board fault
• Ground fault of the compressor
• Coil problem
• IPM error (loose terminal screws,
cracked due to swelling)
• Items listed under "Heatsink overheat
protection" below
• INV board fault
• Ground fault of the compressor
• Coil problem
• IPM error (loose terminal screws,
cracked due to swelling)
• Ground fault of the compressor
• IPM error (loose terminal screws,
cracked due to swelling)
• Ground fault of the compressor
• Shorted output wiring
• INV board fault
• Ground fault of the compressor
• Coil problem
• IPM error (loose terminal screws,
cracked due to swelling)
• Items listed under "Heatsink overheat
protection" below
• INV board fault
• Ground fault of the compressor
• Coil problem
• IPM error (loose terminal screws,
cracked due to swelling)
• INV board CNDC2 wiring fault
• INV board fault
• 72C fault
• Diode stack failure
• INV board fault
• INV board fault
• PCB fault
• Fan motor fault
• INV board fan output fault
• THHS sensor fault
• IPM error (loose terminal screws,
cracked due to swelling)
• THHS sensor fault
• Current sensor fault
• INV board fan output fault
• INV circuit fault
• Compressor fault
• INV board fault
• Ground fault of the compressor and
IPM error
Error reset *3
Unit
side Remote
(PCB)
Operation
SWS1
SW