Mitsubishi Electric PURY-P72TYJMU-A Service Handbook page 321

[ IX Troubleshooting ]
[TJMU-A]
(2) Inverter output related troubles
Items to be checked
[1] <P72 model>
Check the INV
board error
detection cir-
(1) Disconnect the invert-
cuit.
er output wire from
the terminals of the
INV board (SC-U,
SC-V, SC-W).
(2) Put the outdoor unit
into operation.
<P96, P120, P144 mod-
els>
(1) Disconnect the invert-
er output wire from
the output terminals
(U, V, W) of the IPM.
(2) Put the outdoor unit
into operation.
Disconnect the compres-
[2]
Check for sor wiring, and check the
compressor compressor Meg, and coil
ground fault or resistance.
coil error.
HWE0913A
Phenomena
1) IPM/overcurrent breaker trip
(4250 Detail code No. 101, 104,
105, 106, and 107)
2) Logic error
(4220 Detail code No. 111)
3) ACCT sensor circuit failure
(5301 Detail code No.117)
4) IPM open
(5301 Detail code No.119)
1) IPM/overcurrent breaker trip
(4250 Detail code No. 101, 103,
104, 105, 106, and 107)
2) Logic error
(4220 Detail code No. 111)
3) ACCT sensor circuit failure
(5301 Detail code No.117)
4) DCCT sensor circuit failure
(5301 Detail code No.118)
5) IPM open
(5301 Detail code No.119)
1) Compressor Meg failure
Error if less than 1 Mohm.
When no liquid refrigerant in the
compressor
2) Compressor coil resistance failure
Coil resistance value of 0.20 ohm
(20°C [68°F]) : P72 model
Coil resistance value of 0.09 ohm
(20°C [68°F]) :P96 - P144 models
- 312 -
Remedy
Replace the INV board.
Replace the INV board.
Replace the INV board.
Normal
See the section "Troubleshooting
the IPM" ( Refer to - 7 - (5) ).
Replace the IPM, and put the out-
door unit back into operation.
If the problem persists, replace the
INV board.
See the section "Troubleshooting
the IPM" ( Refer to - 7 - (5) ).
Replace the IPM, and put the out-
door unit back into operation.
If the problem persists, replace the
INV board.
Replace the INV board, and put
the outdoor unit back into opera-
tion.
If the problem persists, replace the
DCCT.
Replace the INV board.
Replace the DCCT board.
Replace the DCCT, and put the
outdoor unit back into operation.
If the problem persists, replace the
INV board.
Normal
Replace the compressor
Check that no liquid refrigerant in
the compressor.
GB