Mitsubishi Electric CRHV-P600YA-HPB Service Handbook page 142

[ IX Troubleshooting ]
[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)
HWE1312A
Items to be checked Phenomena
1) Overcurrent-related problems oc-
cur immediately after compressor
startup.
Error code : 4250
Detail code : 101, 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
- 135 -
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 crank-
case 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 crankcase heater
for problems if there is no volt-
age imbalance.
→When the error occurred, liq-
uid refrigerant may have been
present in the compressor.
GB