Mitsubishi Electric PU(H)Y-P250YGM-A, Service Handbook

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[
IX
Troubleshooting ]
4109 Abnormal fan
(IC) If the auxiliary relay X4
(for detecting fan abnor-
mality) is not excited for a
certain period of time, the
fan makes an error stop,
and the fan output turns
to OFF.
Set value of overcurrent
circuit breaker (1) Overcurrent circuit breaker
(51F) trip
Check that the fan is not stalled, the
bearing is not worn out, and the pul-
ley does not come in contact.
Check the tension of the V-belt.
(Check that the belt is not over-ten-
sioned.)
Check that the motor is not stalled.
Check whether 51F malfunctions.
(Leave the test switch ON.)
(2) A fuse (F1) is blown. Check that the fuse is not blown or
not disconnected.
(3) Auxiliary relay (X4) failure Check that the lead wire is not dis-
connected, not broken, or wired
wrongly, that the coil is not faulty,
and that the contact is not faulty.
(4) Broken wire Check that the wire is not discon-
nected.
(5) Disconnected wire Check the contact of the connector.
(6) Indoor controller (I.B1,
I.B2) failure
If the items described above are all
normal, the circuit board is faulty.
4115 Power supply
sync signal ab-
normality The frequency cannot be
determined when the
power is switched on. (1) Power supply error Check the voltage of the power sup-
ply terminal block (TB1).
(2) A fuse is blown Check the fuses on the main board
(F01 and F02).
(3) Faulty wiring Measure voltages of pin 5 of the
male connector (CN20) on the main
board and between pins 1 and 3 of
the male connector (CN21) on the
main board.
If the voltage (AC380~415V) is not
the same as the power supply volt-
age, the wiring is faulty.
(4) Main board failure If none of the items described above
is applicable, and if the trouble reap-
pears even after the power is
switched on again, replace the MAIN
board.
Error Code
Error definition and error
detection method
Cause Check method and remedy
P250 model3.7kW
P500 model5.5kW 7.5A
12A
Model, motor output Set value
PFD