Mitsubishi Electric City Multi CMB-P1016NU-G, Service Handbook

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[
IX
Troubleshooting ]
Refer to section - 7- "Inverter " under part [4] "Trouble shooting principal parts" for error codes related to the inverter.
Error Code
Error definition and error
detection method
Cause Check method and remedy
5301 ACCT sensor
circuit failure
(Detail code
117) When an error value is
detected with the ACCT
detection circuit just be-
fore the inverter starts (1) Compressor INV board
failure
Refer to 9. [4].-7-.(2). [1] "Check the com-
pressor INV board error detection circuit"
(2) Ground fault of compres-
sor and IPM failure
Refer to 9. [4].-7-.(2). [2] "Check for
compressor ground fault or coil error"
Refer to 9. [4].-7-.(2). [5] "Check the in-
verter circuit trouble"
DCCT sensor
circuit failure
(Detail code
118) When an error value is
detected with the DCCT
detection circuit just be-
fore the inverter starts (1) Contact failure
Check the contact of the connector (CNCT)
on the INV board, and the contact the con-
nector on DCCT side.
(2) Compressor INV board
failure
Refer to 9.[4].-7-.(2). [1] "Check the
compressor INV board error detec-
tion circuit".
(3) DCCT failure
When no fault is found with items 1 and 2,
replace the DCCT sensor, and check the
polarity of DCCT sensor.
(4) Grounding fault of the
compressor and IPM fail-
ure
Refer to 9.[4].-7-.(2). [2] "Check for
compressor ground fault or coil er-
ror"
Refer to 9.[4].-7-.(2). [1] "Check the
compressor INV board error detec-
tion circuit"
Refer to 9.[4].-7-.(2). [5] "Check the
inverter circuit trouble"
ACCT sensor
failure
(Detail code
115) When the effective out-
put current between -2
Arms and 2 Arms is de-
tected during inverter op-
eration (1) Contact failure Check the contact of the connector
CNCT2 (ACCT) on the compressor
INV board.
(2) ACCT sensor failure Replace the ACCT sensor.
DCCT sensor
failure
(Detail code
116) When the bus current of
less than 18 Apeak is de-
tected at startup (6Hz) (1) Contact failure Check the contact of the connector
CNCT (DCCT) on the compressor
INV board, and the contact around
the connector on DCCT side.
(2) Misorientation Check the installation direction of
DCCT.
(3) DCCT sensor failure Replace the DCCT sensor.
(4) Compressor INV board
failure
Replace the compressor INV board.
Preliminary
IPM open/Dis-
connected
ACCT connec-
tor
(Detail
code119) When IPM open damage
or disconnected CNCT2
is not detected just be-
fore INV starts
(Sufficient current is not
detected just before star-
tup) (1) Disconnected ACCT sen-
sor
Check the connector CNCT2 con-
nection.(Check ACCT installation
state)
(2) Faulty wiring Check CNDR2 connection on the
compressor INV board, or CNDR1
connection on the G/A board.
(3) ACCT sensor failure Refer to 9.[4].-7-.(4)"Current sensor
ACCT", and check the resistance
value
(4) Disconnected compressor
wiring
Refer to 9.[4].-7-.(2).[2] "Check for
compressor ground fault or coil error"
(5) Compressor INV circuit
failure
Refer to 9.[4].-7-.(2).[2] "Check for
inverter circuit trouble"
ACCT faulty
wiring detec-
tion
(Detail
code120) ACCT sensor is not se-
curely mounted. (1) Wrongly mounted ACCT
sensor
Refer to 9.[4].-7-.(4) "Current sensor
ACCT"