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Check code
Meaning, detecting method
Cause
Checking method & Countermeasure
4103
4109
Reverse phase
abnormality
For motor
abnormality
Reverse phase (or open phase) in
the power system is being de-
tected, so operation cannot be
started.
If the supplemental relay Z3 has
not been energized for a certain
length of time, the unit will make
an error stop, and the fan output
will be off.
1) The phases of the power supply (L1,
L2, L3) have been reversed.
2) Open phase has occurred in the
power supply (L1, L2, L3, N).
3) The wiring is faulty.
4) The fuse is faulty.
5) T01 is faulty.
6) The circuit board is faulty.
1) Over-current breaker trip
2) Blown fuse (F1)
3) Supplemental relay (Z3)
abnormality
4) Breaking of wire
5) Disconnected connector
If there is reverse phase before the
breaker, after the breaker or at the
power supply terminal blocks TB1A,
reconnect the wiring.
Check before the breaker, after the
breaker or at the power supply termi-
nal blocks TB1A, and if there is an open
phase, correct the connections.
a) Check if a wire is disconnected.
b) Check the voltage between each
of the wires.
Check 1 the connections, 2, the con-
tact at the connector, 3, the tightening
torque at screw tightening locations and
4 for wiring disconnections.
TB1A~NF~TB1B~CNTR1~F3~
T01~CNTR
Refer to the circuit number and the wir-
ing diagram plate.
If F1 on the MAIN board, or F3 is
melted, (Resistance between both
ends of the fuse is
∞
), replace the fuses.
To judge failure of the T01, go to “Indi-
vidual Parts Failure Judgment Meth-
ods.”
If none of the items in 1) to 5) is appli-
cable, and if the trouble reappears even
after the power is switched on again,
replace the MAIN board (when replac-
ing the circuit board, be sure to con-
nect all the connectors, etc. securely).
6) Problems with indoor unit
controller (I.B1, I.B2)
· Check for restricted movement of
fan, worn bearing, and pulley con-
tact.
· Check the tension of V belt (to see if
it is too tight).
· Check the motor.
· Malfunction of 51F (with test switch
on).
· Check for a blown
fuse/disconnection.
· Dislocated or disconnected lead
wire, incorrect wiring.
· Coil defect, contact failure.
✻
If no problems are found with the
items above, the problem lies in the
board.
· Check for disconnected wire.
· Check connector contacts.
