–77–
Treatment of Inverter Output Related Troubles
2)
Check item
Symptom
Remedy
[1]
Check the
INV board
error
detection
circuit.
Perform the following:
1
Disconnect INV board
CNDR2. After removing, turn
on the outdoor unit and check
the error status. (The
compressor does not operate
when CNDR2, which carries
the IPM drive signal, has been
disconnected.)
1
IPM/overcurrent error. (4250)
· Replace INV board.
[2]
Check for
compressor
ground fault
or coil error.
Disconnect the compressor wir-
ing, and check the compressor
Meg and coil resistance.
1
Compressor Meg failure
Error if less than 1M
Ω
.
❇
When no refrigerant is
accumulated in the compressor.
2
Compressor coil resistance failure
Coil resistance value of 0.48
Ω
(20
°
C)
· Replace compressor
Check whether the refrigerant is accumu-
lating in the compressor again.
[3]
Check to see
if the inverter
is damaged.
❇
Perform this
check if an
error occurs
immediately
before or
after turning
on the com-
pressor.
Perform the following actions:
1
Reconnect the connector re-
moved in item [1] above.
2
Disconnect the compressor
wiring.
3
Turn on SW1-1 on the INV
board. Operate the outdoor
unit after taking the above two
steps. Check the inverter out-
put voltage.
❇
It is recommended that the
tester be used to determine the
¶
, [1] (5) 5) IPM troubleshoot-
ing when checking the inverter
output voltage.
❇
Measure when the inverter out-
put frequency is stable.
1
IPM/overcurrent error.
(4250)
2
There is a strong possibility of an
inverter circuit error if the voltage
unbalance across all wiring is
greater than the larger of the
values represented by 5% or 5V.
3
No voltage unbalance across all
wiring
2
No voltage unbalance across all
wiring
· Refer to item [5] for inverter circuit trouble.
[4]
Check to see
if the inverter
is damaged.
❇
Perform this
check if an
error occurs
during
steady op-
eration.
Turn on the outdoor unit.
Check the inverter output volt-
age.
❇
It is recommended that the
tester be used to determine the
¶
, [1] (5) 5) IPM troubleshoot-
ing when checking the inverter
output voltage.
❇
Measure when the inverter out-
put frequency is stable.
1
There is a strong possibility of an
inverter circuit error if the voltage
unbalance across all wiring is
greater than the larger of the
values represented by 5% or 5V.
· Refer to item [5] for inverter circuit trouble.
See item [2].
Proceed to item [5] if there is no problem in
[2]. Replace the compressor if there is no
problem in [5].
See item [2].
Proceed to item [5] if there is no problem in
[2]. Replace the compressor if there is no
problem in [5].
2
ACCT sensor circuit error.
(5301 detailed No. 6)
See to
¶
[1] (5) 4)
"Current Sensor ACCT"
Check the resistance and replace if
erroneous. Replace the INV board if the
ACCT status is normal.
3
ACCT sensor circuit error.
(5301 detailed No. 13)
· INV board error detection circuit is normal.
Because IPM cannot run, if the CNDR2 is
disconnected.