[8-9 Troubleshooting Inverter Problems ]
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HWE12050 GB
8-9-2 Checking the Inverter Board Error Detection Circuit
8-9-3 Checking the Compressor for Ground Fault and Coil Resistance Problems
8-9-4 Checking the Inverter for Damage at No-Load
Items to be checked Phenomena Remedy
(1) Remove power supply. 1) Overcurrent error
Error code: 4250
Detail code: No. 101, 104, 105, 106, and
107
Replace the INV board.
(2) Disconnect the inverter
output wire from the ter-
minals of the INV board
(SC-U, SC-V, SC-W).
2) Logic error
Error code: 4220
Detail code: No. 111
Replace the INV board.
(3) Apply power supply. 3) ACCT sensor circuit failure
Error code: 5301
Detail code: No.117
Replace the INV board.
(4) Put the outdoor unit into
operation.
4) IPM open
Error code: 5301
Detail code: No.119
Normal
Items to be checked Phenomena Remedy
Disconnect the compressor wir-
ing, and check the compressor
Meg, and coil resistance.
1) Compressor Meg failure
Error if less than 1 M.
Check that there is no liquid refrigerant
in the compressor.
If there is none, replace the compres-
sor.
2) Compressor coil resistance failure
Coil resistance value of 0.71
(20°C [68°F]): EP200, EP250 models
Coil resistance value of 0.32
(20°C [68°F]): EP300, EP350 models
Coil resistance value of 0.30
(20°C [68°F]): EP400, EP450 models
Replace the compressor.
Items to be checked Phenomena Remedy
(1) Remove power supply. 1) Inverter-related problems are detected. Connect the short-circuit connector to
CN6, and go to section 8-9-2.
(2) Disconnect the inverter
output wire from the ter-
minals of the INV board
(SC-U, SC-V, SC-W).
2) Inverter voltage is not output at the termi-
nals (SC-U, SC-V, and SC-W)
Replace the INV board.
(3) Disconnect the short-cir-
cuit connector from CN6
on the INV board.
3) There is an voltage imbalance between
the wires.
Greater than 5% imbalance or 5V
Replace the INV board.
(4) Apply power supply.
(5) Put the outdoor unit into
operation.
Check the inverter output
voltage after the inverter
output frequency has sta-
bilized.
4) There is no voltage imbalance between
the wires.
Normal
*Reconnect the short-circuit connector
to CN6 after checking the voltage.
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