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Mitsubishi Electric CAHV-P500YA-HPB Instruction Manual page 10

Air-cooled heat pump unit cahv series
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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

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