Mitsubishi Electric PUHY-P120YHMU-A, Service Manual

Page: 255 / 326

[
IX
Troubleshooting ]
- 246 - HWE0804A GB
(2) Inverter output related troubles
Items to be checked Phenomena Remedy
[1]
Check the INV
board error
detection cir-
cuit. <P72 and P96 models> 1) IPM/overcurrent breaker trip
Error code: 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
Error code: 4220
Detail code: No. 111 Replace the INV board.
(2) Put the outdoor unit
into operation. 3) ACCT sensor circuit failure
Error code: 5301
Detail code: No.117 Replace the INV board.
4) IPM open
Error code: 5301
Detail code: No.119 Normal
<P120 model> 1) IPM/overcurrent breaker trip
Error code: 4250
Detail code: No. 101, 102, 103, 104,
105, 106, and 107 See the section "Troubleshooting
the IPM" ( Refer to - 6 - [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
Error code: 4220
Detail code: No. 111 See the section "Troubleshooting
the IPM" ( Refer to - 6 - [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
Error code: 5301
Detail code: No.117 Replace the INV board.
4) DCCT sensor circuit failure
Error code: 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
Error code: 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]