Mitsubishi Electric PUHY-P120YHMU-A, Service Manual

Page: 263 / 326

[
IX
Troubleshooting ]
- 254 - HWE0804A GB
(2) Inverter output related troubles
Items to be checked Phenomena Remedy
[1]
Check the
INV board er-
ror detection
circuit. (1) Disconnect the invert-
er output wire from
the terminals of the
INV board (SC-U,
SC-V, SC-W). 1) Overcurrent error
Error code: 4250
Detail code: No. 101, 104, 105,
106, and 107 Replace the INV board.
(2) Put the outdoor unit
into operation. 2) Logic error
Error code: 4220
Detail code: No. 111 Replace the INV board.
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
[2]
Check for
compressor
ground fault
or coil error. Disconnect the compressor
wiring, and check the com-
pressor Meg, and coil resis-
tance. 1) Compressor Meg failure
Error if less than 1 Mohm. Check that there is no liquid re-
frigerant in the compressor.
If there is none, replace the com-
pressor.
2) Compressor coil resistance failure
Coil resistance value of 1 ohm
(20°C [68°F]): - P96models
Coil resistance value of 0.6 ohm
(20°C [68°F]): P120 model Replace the compressor.
[YHMU-A]