Mitsubishi Electric PURY-(E)P200, Service Handbook

Page: 291 / 362

[
IX
Troubleshooting ]
- 28
2
- HWE0713A GB
Items to be checked Phenomena Remedy
[3]
Check wheth-
er the inverter
is damaged.
(No load) (1) Disconnect the inverter
output wire from the termi-
nals of the inverter board
(SC-U, SC-V, SC-W). 1) Inverter-related problems are de-
tected. Connect the short-circuit
connector to CN6, and go to
section [1].
(2) Disconnect the short-cir-
cuit connector from CN6
on the inverter board. 2) Inverter voltage is not output at the
terminals (SC-U, SC-V, and SC-W) Replace the INV board.
(3) Put the outdoor unit into
operation.
Check the inverter output
voltage after the inverter
output frequency has sta-
bilized. 3) There is an voltage imbalance be-
tween the wires.
Greater than 5% imbalance or 5V Replace the INV board.
4) There is no voltage imbalance be-
tween the wires. Normal
*Reconnect the short-circuit
connector to CN6 after
checking the voltage.
[4]
Check wheth-
er the inverter
is damaged.
(During com-
pressor opera-
tion) Put the outdoor unit into opera-
tion.
Check the inverter output volt-
age after the inverter output fre-
quency has stabilized. 1) Overcurrent-related problems occur
immediately after compressor start-
up.
Error code: 4250
Detail code: 101, 106, 107 a. Check items [1] through
[3] for problems.
b. Check that high and low
pressures are bal-
anced.
c. Check that no liquid re-
frigerant is present in
the compressor.
ĺ
Go to "d." when the
problem persists after
compressor startup was
repeated several times.
If normal operation is
restored, check the
crankcase heater for
problems.
d. Check that there is a
pressure difference be-
tween high and low
pressures after com-
pressor startup.
ĺ Check the high pres-
sure with LED monitor
for changes.
Replace the compres-
sor if there is no pres-
sure difference. (the
compressor may be
locked.)
2) There is an voltage imbalance be-
tween the wires.
Greater than 5% imbalance or 5V Replace the INV board if
there is a voltage imbalance.
Check the crankcase heater
for problems if there is no
voltage imbalance.
When the error occurred, liq-
uid refrigerant may have
been present in the com-
pressor.
[5]
Check the fan
motor ground
fault or the
winding. Remove the wire for the out-
door fan motor, and check the
fan motor megger and the
winding resistance. 1) Fan motor megger failure
Failure when the megger is 1Mohm
or less. Replace the fan motor.
2) Fan motor disconnection
Standard: The winding resistance is
approximately several ohm.
(It varies depending on the temper-
ature, or while the inner thermo is
operating, it will be
ohm)