Mitsubishi Electric PUHY-P200 Service Handbook page 112

Checking code Meaning, detecting method
IPM-
5301 IPM open damage or CNCT2
open/ACCT
5305 dislocation was detected just
connection
before INV started. (Sufficient
abnormality
current was not detected during
(Error details self-diagnosis just before
No.119) starting.)
ACCT Improper installation of the
miss-wiring
ACCT sensor was detected.
abnormality
(Error details
No.120)
✻
For the check code on the inverter, refer to
ACCT-U
← Compressor-input
phase U
2. Communication/system errors
Checking
Meaning, detecting method
code
Multiple address abnormality
6600
Transmission from units with the
same address is detected.
Note:
The address/attribute shown on
remote controller indicates the
controller which has detected
error.
Unset polarity
6601
The error detected when
transmission processor cannot
distinguish the polarities of the
M-NET transmission line.
Cause
(1) ACCT sensor is dislocated
(2) Wire connection is faulty.
(3) ACCT is faulty.
(4) Compressor is disconnected
(5) Inverter circuit is faulty.
(1) ACCT sensor incorrectly
installed.
" "
6. Inverter and compressor in the section [4]
→ IPM-output ← Compressor-input
phase U phase W
Red wire
Cause
(1) Two or more controllers of
outdoor unit, indoor unit,
remote controller, etc. have
the same address.
<Example>
Error display of the remote
controller 6600 "01"
Unit No.1 detected the error
Two Units No.1 or more are in
a same system.
(1) No voltage is applied to the
M-NET transmission line that
G-50A is connected to.
(2) M-NET transmission line to
which G-50A is connected is
short-circuited.
- 110 -
Checking method & Countermeasure
Check CNCT2 sensor
connection (Check ACCT
installation state)
Check CNDR2 connection on
INV board, or CNDR1
connection on G/A board
Refer to 9.[4].6.(4)
"Current sensor ACCT"
resistance value
Refer to 9.[4].6.(2).[2]
"Check for compressor ground
fault or coil error".
Refer to 9.[4].6.(2).[5]
"Check the inverter circuit
trouble".
Refer to 9.[4].6.(4)
"Current sensor ACCT".
"
Troubleshooting of principal parts
ACCT-W
→ IPM-output
Checking method & Countermeasure
Search for the unit which has the same
address with that of the source of the
trouble.
When the same address is found,
turn off the power source of
outdoor unit, and indoor unit for 5
minutes or more after modifying
the address, and then turn on it
again.
Check if power is supplied to the M-
NET transmission line of the G-50A,
and correct any problem found.
"
phase W
Black wire