Mitsubishi Electric City Multi PQHY-P72 Service Handbook page 201

[ IX Troubleshooting ]
Error Code
4115 Power supply
sync signal ab-
normality
4116 Motor abnor-
mality
Error definition and error
detection method
The frequency cannot be (1) Power supply error
determined when the
power is switched on.
(2) A fuse is blown
(3) Faulty wiring
(4) Main board failure
1. LOSSNAY (1) Board failure
The motor keep running
(2) Motor malfunction
even if the power is OFF.
(3) Solenoid switch malfunc-
The thermal overload re-
lay is ON. (Only for the
three-phase model)
2. 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.
Cause
tion
- 192 -
Check method and remedy
Check the voltage of the power sup-
ply terminal block (TB1).
Check the fuses on the main board
(F01 and F02).
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 (AC208/230V) is not
the same as the power supply volt-
age, the wiring is faulty.
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.
Replace the board.
Check for the motor and the solenoid
switch.