- 131 -
Checking code
4115
Meaning, detecting method
Cause
Checking method & Countermeasure
Power supply
sync signal
abnormality
The frequency cannot be
determined when the power is
switched on.
(The power supply’s frequency
cannot be detected. The
outdoor fan cannot be controlled
by phase control.)
(1) There is an open phase in
the power supply.
(2) A fuse is defective.
(3) Faulty wiring.
(4) The circuit board is defective.
Check before the breaker, after
the breaker or at the power
supply terminal blocks TB1, and
if there is an open phase,
correct the connections.
If F01 or F02 on the MAIN board
is meltted, (Resistance between
both ends of the fuse is
∞
),
replace the fuses.
Check voltage between the pin-5
on the main board connector
(CN20), between the pin-1 and
the pin-3 on CN21. When the
voltage is not the same as the
power source voltage (380-415V),
the wiring is faulty.
If none of the items in (1) to (3)
is applicable, and if the trouble
reappears even after the power
is switched on again, replace
the MAIN board (when replacing
the circuit board, be sure to
connect all the connectors,
ground wires, etc. securely).
4116 Fan speed
abnormality
(motor
abnormality)
[ LOSSNAY ]
1. The motor keep running even
if the power is OFF.
2. The thermal overload relay is
ON. (Only for the three-phase
model)
[ Indoor unit ]
If detected less than 180rpm
or more than 2000rpm, the
indoor unit will restart and
keep running for 3 minutes. If
detected again, the display
will appear.
(1) Defective board.
(2) Motor malfunction.
(3) Solenoid switch malfunction.
Replace the board.
Check for the motor and the
solenoid switch.
4220
4225
Bus voltage
drop
abnormality
(Error details
No.108)
If Vdc 289V is detected during
operation. (Software detection)
(1) Power environment.
(2) Voltage drop detected.
Check whether the unit makes
an instantaneous stop when the
detection result is abnormal or a
power failure occurs.
Check whether the power
voltage 289V across all phases.
<In the case of 4220>
Check the voltage of the
connector (CNDC2) on the INV
board.
→
Replace the INV board when
there is no voltage drop.
→
Check the followings when
there is a voltage drop.
1
Check the voltage of CN52C
on the main board
→
Refer to (3)
2
Check whether 52C1 works
normally
→
Refer to (4)
Or check 52C1-connecting
piping.
3
Check for the diode stack
→
Refer to (5)
4
Check for the wiring and the
connectors between the
CNDC2 on the INV board and
the CNDC1 on the G/A board.
Replace G/A board when no fault
is found for the above
1
~
4
.
