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[ IX Troubleshooting ]
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HWE09080 GB
(2) Inverter output related troubles
Items to be checked Phenomena Remedy
[1]
Check the INV
board error
detection cir-
cuit.
(1) Disconnect the invert-
er output wire from
the terminals of the
INV board (SC-U,
SC-V, SC-W).
1) IPM/overcurrent breaker trip
Error code: 4250
Detail code: No. 101, 104, 105, 106,
and 107
Replace the INV board.
(2) Put the heat source
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 compres-
sor wiring, and check the
compressor Meg, and coil
resistance.
1) Compressor Meg failure
Error if less than 1 Mohm.
When no liquid refrigerant in the
compressor
Check that no liquid refrigerant is
present in the compressor, and re-
place the compressor.
2) Compressor coil resistance failure
Coil resistance value of 0.3 ohm
(20°C [68°F])
Replace the compressor.
[3]
Check wheth-
er the inverter
is damaged.
(No load)
(1) Disconnect the invert-
er output wire from
the terminals of the
INV board (SC-U,
SC-V, SC-W).
1) Inverter-related problems are de-
tected.
Connect the short-circuit connec-
tor to CN6, and go to section [1].
(2) Disconnect the short-
circuit connector from
CN6 on the INV
board.
2) Inverter voltage is not output. Replace the INV board.
(3) Put the heat source
unit into operation.
Check the inverter
output voltage after
the inverter output
frequency has stabi-
lized.
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 con-
nector to CN6 after checking the
voltage.
[4]
Check wheth-
er the inverter
is damaged.
(During com-
pressor oper-
ation)
Put the heat source unit
into operation.
Check the inverter output
voltage after the inverter
output frequency has sta-
bilized.
1) There is an voltage imbalance be-
tween the wires.
Greater than 5% imbalance or 5V
If the problem persists, replace the
INV board.
If the problem persists after replac-
ing the above parts, go to section
[2].
[THMU-A]