Mitsubishi Electric CITY MULTI PUHY-P200YEM-A Service Handbook page 135

Checking code Meaning, detecting method
An abnormal value was de-
DCCT sensor
5301
tected with the DCCT detec-
circuit error
tion circuit just before the INV
(Error details
started.
No. 118)
IPM open damage or CNCT2
IPM open/CNCT2
dislocation was detected just
dislocation error
before INV started. (Sufficient
(Error details
current was not detected dur-
No. 119)
ing self-diagnosis just before
starting.)
Improper installation of the
Incorrect wiring
ACCT sensor was detected.
detection error
(Error details
No. 120)
Compressor-input
phase U
1) Contact is faulty.
2) INV board fault
3) DCCT is faulty.
4) Compressor is faulty.
5) Compressor ground fault and IMP
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.
ACCT_U
IPM-output
phase U
Red wire
Cause
Inverter circuit is fault.
fault.
Compressor-input
phase W
- 134 -
Checking method & Countermeasure
Check the contacts around the INV board
connector CNCT and DCCT side connector
Refer to¶ [1] (7) 2) [1].
[Check INV board error detection circuit]
If there is no problem up to step 2), replace
DCCT and check the DCCT polarity.
Refer to ¶ [1] (7) 2) [2]. "Check
compressor ground fault" and
winding error"
Refer to ¶ [1] (7) 2) [5].
"Check inverter circuit fault".
Refer to ¶ [1] (7) 2) [2]. "Check
compressor ground fault" and
winding error"
Refer to ¶ [1] (7) 2) [5].
"Check inverter circuit fault".
Check CNCT2 sensor connection (Check
ACCT installation state)
Check CNDR2 connection on INV
board, or CNDR1 connection on
G/A board
Refer to ¶ [1] (7) 4) Check "current
sensor ACCT" resistance value
Refer to ¶ [1] (7) 2) [2].
"Check compressor ground fault"
and winding error"
Refer to ¶ [1] (7) 2) [5].
"Check inverter circuit fault".
Refer to ¶ [1] (7) 4).
"Current sensor ACCT"
ACCT_W
IPM-output
phase W
Black wire