Mitsubishi City Multi PURY-P400 Service Handbook page 112

Checking code Meaning, detecting method
4103 Reverse phase Reverse phase (or open phase) in
abnormality the power system is being de-
tected, so operation cannot be
started.
4115 Power supply The frequency cannot be deter-
sync signal mined when the power is switched
abnormality on.
(The power supply's frequency
cannot be detected. The outdoor
fan cannot be controlled by phase
control.)
Cause
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) There is an open phase in the power
supply (L1, L2, L3, N).
2) The power supply voltage is dis-
torted.
3) A fuse is defective.
4) T01 is defective.
5) The circuit board is defective.
–111–
Checking method & Countermeasure
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 blown,
(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) through 5) is
applicable, and if the problem persists
even after the power is switched on
again, replace the MAIN board (When
replacing the circuit board, be sure to
connect all the connectors, etc. se-
curely)
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.
If the power supply voltage waveform
is distorted from a sine wave, improve
the power supply environment.
If F1 on the MAIN board, or F3 is blown,
(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) through 4) is
applicable, and if the problem persists
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).