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Checking code Meaning, detecting method Cause Checking method & Countermeasure
If the heat sink temperature
(THHS)
60°C for 10 minutes
or longer just before the inverter
starts.
If a heat sink temperature of
(THHS) 40°C is detected just
before starting of, and during
operation of the inverter.
•If IDC 20 A is detected just
before the inverter starts, or
•If IDC 10 A is detected dur-
ing inverter operation after 5
seconds has passed since the
inverter started when the INV
board’s SW1-1 is OFF.
Cooling fan
trouble
Radiator panel
IDC sensor/
circuit trouble
4260
5110
5301
Same as “4230.”
Judge that the THHS has failed. Go
to error code “5110.”
Check the contacts of CNTH on the
INV board.
If none of the items in 1) to 2) is ap-
plicable, and if the trouble reap-
pears even after the power is
switched on again, replace the INV
board (when replacing the circuit
board, be sure to connect all the
connectors, ground wires, etc. se-
curely).
Check the contacts of CNCT on the
INV board.
Check the DCCT polarity.
•With SW1-1 OFF, is the inverter’s
output wiring open?
•With SW1-1 OFF, is a compressor
which is not specified for this model
connected to the inverter’s output?
If none of the items in 1) to 3) is ap-
plicable, and if the trouble reap-
pears even after the power is
switched on again, replace the INV
board and the DCCT (when replac-
ing the circuit board, be sure to con-
nect all the connectors, ground
wires, etc. securely) by the following
procedure.
1 Replace the INV board only. If it
recovers, the INV board is defec-
tive.
2 If it does not recover, reinstall the
INV board and replace the DCCT.
If it recovers, the DCCT is defec-
tive.
If it does not recover after 1 and 2
above, both the INV board and the
DCCT are defective.
1) Same as “4230.”
1) The THHS Sensor is defective.
2) Contact is faulty.
3) The INV board is defective.
1) Contact is faulty.
2) The current sensor (DCCT) is con-
nected with reverse polarity.
3) An error was made in the SW1-1
setting.
4) The INV board is defective. The
current sensor (DCCT) is defective.
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