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Checking code
4103
Meaning, detecting method
Cause
Checking method & Countermeasure
Reverse
phase
abnormality
2. When turning on the power,
the operation cannot be
started because of the open
phase of one of the power
lines (L1 or L2).
1. The operation cannot be
started because of the
reserve phase of one of the
power lines (L1, L2 or L3).
(1) Power supply failure
a) Open phase of power
supply voltage
b) Power supply voltage drop
(2) Faulty wiring
Between the voltage
terminal block (TB1) and the
main boards (CN20 and 21)
(3) Blown fuse
(4) Main board failure
(1) Faulty wiring
(2) Main board failure
Check the input resistance of
the power supply terminal block
(TB1).
· Check the voltage of No.5 pin
of the main board connector
(CN20) and the voltage
between No.1 and 3 pin of
CN21.
· If the voltage is not the same
as the power supply voltage,
the wiring is faulty.
Check whether the fuses of the
main board (both F01 and F02)
are not blown.
If the above faults are not found,
the main board is faulty.
· Check whether the phase of
the power supply terminal
block (TB1) is normal.
· Check the wiring between the
power supply terminal block
(TB1) and the main boards
(CN20 and CN21).
4108 Over-current
protection
1. First detection
If 51C2 is started during the
operation of No.2 compressor,
the outdoor unit stops once,
turns to anti-restart mode for
3 minutes, and restarts after
3 minutes. (Set value of the
over-current relay: 55A)
2. Second detection
If 51C2 is started again within
a minute after restarting in
compliance with 1. above, the
unit makes an error stop and
the error code “4108” will
appear.
3. There will be a minute grace
period of an error stop when
No.2 compressor restarts
after the outdoor unit stops
and LED indicates, which
means the grace period, will
appear.
(1) Overload operation that
exceeds unit use limit
(2) Power supply error
a) Power-supply voltage drop
b) Power-supply voltage
open phase
(3) Wiring defect
(4) Compressor malfunction
a) Compressor open phase,
grounding fault
b) Compressor lock
Check the unit working condition.
Check the voltage of the power-
supply terminal block (TB1).
Check for open phase.
Check 52C2 connector and the
wiring.
Check the wiring and apply a
megger to the compressor.
Start operation under no-load
conditions.
Remove the power wire on the
compressor-side, insulate the
power line and start operation.
→
The compressor is faulty if
52C2 normally turns on.
If the above faults are not found,
the main board is faulty.
Pin
CN20 5 Pin
CN21 3 Pin
CN21 1 Pin
TB1
L1
N
L2
