Table of Contents
[8-10 Troubleshooting Inverter Problems (TKMU) ]
8-10-2
Checking the Inverter Board Error Detection Circuit
Items to be checked
(1) Remove power sup-
ply.
(2) Disconnect the invert-
er output wire from
the output terminals
(U, V, W) of the IPM.
(3) Apply power supply.
(4) Put the outdoor unit
into operation.
8-10-3
Checking the Compressor for Ground Fault and Coil Resistance Problems
Items to be checked
Disconnect the compressor
wiring, and check the compres-
sor Meg, and coil resistance.
8-10-4
Checking the Inverter for Damage at No-Load
Items to be checked
(1)
Remove power supply.
(2)
Disconnect the inverter output
wire from the output terminals (U,
V, W) of the IPM.
(3)
Turn on SW1-1 on the INV
board.
(4)
Apply power supply.
(5)
Put the outdoor unit into oper-
ation.
HWE13080
Phenomena
1)
IPM/overcurrent breaker trip
Error code: 4250
Detail code: No. 101, 103, 104, 105,
106, and 107
2)
Logic error
Error code: 4220
Detail code: No. 111
3)
ACCT sensor circuit failure
Error code: 5301
Detail code: No.117
4)
DCCT sensor circuit failure
Error code: 5301
Detail code: No.118
5)
IPM open
Error code: 5301
Detail code: No.119
Phenomena
1)
Compressor Meg failure
Error if less than 1 Mohm.
When no liquid refrigerant in the compres-
sor
2)
Compressor coil resistance failure
Coil resistance value of 0.092 Ω
(20°C [68°F])
Phenomena
1)
Inverter-related problems
are detected.
2)
Inverter voltage is not out-
put.
3)
There is an voltage imbal-
ance between the wires.
Greater than 5% imbalance
or 5V
4)
There is no voltage imbal-
ance between the wires.
- 290 -
Remedy
Refer to the following page(s).
[8-10-14 Troubleshooting Problems with Intelligent
Power Module](page 296)
Replace the IPM, and put the outdoor unit back into
operation.
If the problem persists, replace the INV board.
Refer to the following page(s).
[8-10-14 Troubleshooting Problems with Intelligent
Power Module](page 296)
Replace the IPM, and put the outdoor unit back into
operation.
If the problem persists, replace the INV board.
Replace the INV board, and put the outdoor unit
back into operation.
If the problem persists, replace the DCCT.
Replace the INV board.
Replace the DCCT board.
Replace the DCCT, and put the outdoor unit back
into operation.
If the problem persists, replace the INV board.
Normal
Remedy
Replace the compressor
Check that no liquid refrigerant in the
compressor.
Remedy
Turn off SW1-1 and go to section 8-10-2.
Check the connection between the IPM and the CNIPM
on the INV board.
Replace the IPM.
If the problem persists, replace the INV board.
Replace the IPM.
If the problem persists, replace the INV board.
Normal
*Turn off SW1-1
GB
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