Mitsubishi Electric PURY-P72 Service Handbook page 333

[ IX Troubleshooting ]
[YKMU-A]
Items to be checked
[4] Put the outdoor unit into oper-
Check whether ation.
the inverter is Check the inverter output volt-
damaged. age after the inverter output
(During com- frequency has stabilized.
pressor opera-
tion)
HWE1116D
Phenomena
1) Overcurrent-related problems oc-
cur immediately after compressor
startup.
Error code : 4250
Detail code : 101, 102, 106, 107
2) There is a voltage imbalance be-
tween the wires after the inverter
output voltage is stabilized.
Greater than the larger of the fol-
lowing values: imbalance of 5% or
5V
- 324 -
Remedy
a. Check items [1] through
[3] for problems.
b. Check that high and low
pressures are balanced.
c. Check that no liquid refrig-
erant is present in the
compressor.
Go to "d." when the
problem persists after
compressor startup was
repeated several times.
If normal operation is re-
stored, check the belt
heater for problems.
d. Check that there is a pres-
sure difference between
high and low pressures af-
ter compressor startup.
Check the high pressure
with LED monitor for
changes.
Replace the compressor if
there is no pressure differ-
ence. (the compressor
may be locked.)
Replace the INV board if there
is a voltage imbalance.
Check the belt heater for prob-
lems if there is no voltage im-
balance.
When the error occurred,
liquid refrigerant may have
been present in the compres-
sor.
GB