Mitsubishi Electric City Multi PQHY-P72 Service Handbook page 244

Error definition and error
Error Code
5301 ACCT sensor When an error value is
circuit failure detected with the ACCT
(Detail code detection circuit just be-
117) fore the inverter starts
DCCT sensor When an error value is
circuit failure detected with the DCCT
(Detail code detection circuit just be-
118) fore the inverter starts
ACCT sensor When the effective out-
failure put current between -2
(Detail code Arms and 2 Arms is de-
115) tected during inverter op-
eration
DCCT sensor When the bus current of
failure less than 18 Apeak is de-
(Detail code tected at startup (6Hz)
116)
Preliminary When IPM open damage
IPM open/Dis- or disconnected CNCT2
connected is not detected just be-
ACCT connec- fore INV starts
tor (Sufficient current is not
(Detail detected just before star-
code119) tup)
ACCT faulty ACCT sensor is not se-
wiring detec- curely mounted.
tion
(Detail
code120)
Refer to section - 7- "Inverter " under part [4] "Trouble shooting principal parts" for error codes related to the inverter.
detection method
(1) Compressor INV board
failure
(2) Ground fault of compres-
sor and IPM failure
(1) Contact failure
(2) Compressor INV board
failure
(3) DCCT failure
(4) Grounding fault of the
compressor and IPM fail-
ure
(1) Contact failure
(2) ACCT sensor failure
(1) Contact failure
(2) Misorientation
(3) DCCT sensor failure
(4) Compressor INV board
failure
(1) Disconnected ACCT sen-
sor
(2) Faulty wiring
(3) ACCT sensor failure
(4) Disconnected compressor
wiring
(5) Compressor INV circuit
failure
(1) Wrongly mounted ACCT
sensor
- 235 -
Cause Check method and remedy
Refer to 9. [4].-7-.(2). [1] "Check the com-
pressor INV board error detection circuit"
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"
Check the contact of the connector (CNCT)
on the INV board, and the contact the con-
nector on DCCT side.
Refer to 9.[4].-7-.(2). [1] "Check the
compressor INV board error detec-
tion circuit".
When no fault is found with items 1 and 2,
replace the DCCT sensor, and check the
polarity of DCCT sensor.
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"
Check the contact of the connector
CNCT2 (ACCT) on the compressor
INV board.
Replace the ACCT sensor.
Check the contact of the connector
CNCT (DCCT) on the compressor
INV board, and the contact around
the connector on DCCT side.
Check the installation direction of
DCCT.
Replace the DCCT sensor.
Replace the compressor INV board.
Check the connector CNCT2 con-
nection.(Check ACCT installation
state)
Check CNDR2 connection on the
compressor INV board, or CNDR1
connection on the G/A board.
Refer to 9.[4].-7-.(4)"Current sensor
ACCT", and check the resistance
value
Refer to 9.[4].-7-.(2).[2] "Check for
compressor ground fault or coil error"
Refer to 9.[4].-7-.(2).[2] "Check for
inverter circuit trouble"
Refer to 9.[4].-7-.(4) "Current sensor
ACCT"
[ IX Troubleshooting ]