Mitsubishi Electric PURY-P120Y(T)HMU-A, Service Handbook

Page: 304 / 387

[
IX
Troubleshooting ]
- 295 - HWE0803A GB
(2) Inverter output related troubles
Items to be checked Phenomena Remedy
[1]
Check the INV
board error
detection cir-
cuit. <P72 model> 1) IPM/overcurrent breaker trip
(4250 Detail code No. 101, 104,
105, 106, and 107) Replace the INV board.
(1) Disconnect the invert-
er output wire from
the terminals of the
INV board (SC-U,
SC-V, SC-W). 2) Logic error
(4220 Detail code No. 111) Replace the INV board.
(2) Put the outdoor unit
into operation. 3) ACCT sensor circuit failure
(5301 Detail code No.117) Replace the INV board.
4) IPM open
(5301 Detail code No.119) Normal
<P96 and P120 models> 1) IPM/overcurrent breaker trip
(4250 Detail code No. 101, 102,
103, 104, 105, 106, and 107) 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.
(1) Disconnect the invert-
er output wire from
the output terminals
(U, V, W) of the IPM. 2) Logic error
(4220 Detail code No. 111) 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.
(2) Put the outdoor unit
into operation. 3) ACCT sensor circuit failure
(5301 Detail code No.117) Replace the INV board.
4) DCCT sensor circuit failure
(5301 Detail code No.118) Replace the DCCT board.
Replace the DCCT, and put the
outdoor unit back into operation.
If the problem persists, replace the
INV board.
5) IPM open
(5301 Detail code No.119) Normal
[2]
Check for
compressor
ground fault or
coil error. Disconnect the compres-
sor wiring, and check the
compressor Meg, and coil
resistance. 1) Compressor Meg failure
Error if less than 1 Mohm.
When no liquid refrigerant in the
compressor Replace the compressor
Check that no liquid refrigerant in
the compressor.
2) Compressor coil resistance failure
Coil resistance value of 0.3 ohm
(20°C [68°F]) : -P96 models
Coil resistance value of 0.3 ohm
(20°C [68°F]) :P120 model
[THMU-A]