Checking code Meaning, detecting method Cause Checking method & Countermeasure
If VDC 220 V is detected dur-
ing inverter operation.
If the cooling fan stays ON for 5
minutes or longer during in-
verter operation, and if THHS
92°C is detected.
Bus voltage
trouble
Radiator
panel
overheat
protection
4220
4230
•Check if an instantaneous stop or
power failure, etc. has occurred.
•Check if the voltage is the rated
voltage value.
Check 1, the connections, 2, contact
at the connectors, 3 tightening
torque at screw tightened portions,
4, wiring polarities, 5, for broken
wires, and 6, for grounding in the fol-
lowing wiring.
TB1 ~ DS ~ Power Board ~ 52C
~ R1 ~ DCL ~ C1 ~IPM ~ G/A
Board (F1) ~ CNDC1 ~ CNDC2
Wiring
CN15V1 ~ CN15V2 Wiring
CNDR1 ~ CNDR2 Wiring
✻Check if the wiring polarities are as
shown on the wiring diagram plate.
To judge failure of R1, go to
“Individual Parts Failure Judgment
Methods.”
To judge failure of the 52C, go to
“Individual Parts Failure Judgment
Methods.”
To judge failure of the DS, go to “In-
dividual Parts Failure Judgment
Methods.”
To judge failure of the DCL, go to
“Individual Parts Failure Judgment
Methods.”
•Check the wiring between the IPM
and the compressor.
•Check the compressor’s insulation
resistance.
Check the capacity of C1. (If
C1<
=3700 µF is defective)
If none of the items in 1) to 8) is ap-
plicable, and if the trouble reappears
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. securely).
Check 1 connections, 2 contact at
the connectors and 3 for broken
wires in the following wiring.
MF1~CNFAN
If the fuse is defective, replace the
fuse.
To judge failure of the MF1, go to
“Individual Parts Failure Judgment
Methods.”
To judge failure of the THHS, go to
error code “5110”.
If the air passage of the heat sink is
clogged, clear the air passage.
If none of the items in 1) to 5) is ap-
plicable, and if the trouble reappears
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. securely).
1) The power supply voltage is abnor-
mal.
2) The wiring is defective.
3) The rush current prevention resis-
tors (R1) are defective.
4)The electromagnetic contactor
(52C) is defective.
5) The diode stack (DS) is defective.
6) The reactor (DCL) is defective.
7) The inverter output is grounded.
8) The capacitor (C1) is defective
9) The circuit board is defective.
1) The wiring is defective.
2) The INV board fuse (F01) is defec-
tive.
3) The cooling fan (MF1) is defective.
4) The THHS sensor is defective.
5) The air passage is clogged.
6) The INV board is defective.
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