Mitsubishi Electric PURY-P72 Service Handbook page 312

[ IX Troubleshooting ]
[YHMU-A]
(2) Inverter output related troubles
Items to be checked
[1] (1) Disconnect the invert-
Check the er output wire from
INV board er- the terminals of the
ror detection inverter board (SC-U,
circuit. SC-V, SC-W).
(2) Put the outdoor unit
into operation.
[2] Disconnect the compressor
Check for wiring, and check the com-
compressor pressor Meg, and coil resis-
ground fault tance.
or coil error.
HWE0803A
Phenomena
1) Overcurrent error
(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) Compressor Meg failure
Error if less than 1 Mohm.
2) Compressor coil resistance failure
Coil resistance value of 1 ohm
(20°C [68°F]): - P96 models
Coil resistance value of 0.6 ohm
(20°C [68°F]): P120 model
- 303 -
Remedy
Replace the INV board.
Replace the INV board.
Replace the INV board.
Normal
Check that there is no liquid re-
frigerant in the compressor.
If there is none, replace the com-
pressor.
Replace the compressor.
GB