Mitsubishi Electric City Multi PQHY-P72 Service Handbook page 235

[ 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 run-
(2) Motor malfunction
ning even if the pow-
(3) Solenoid switch malfunc-
er is OFF.
The thermal over-
load relay 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
- 226 -
Check method and remedy
Check the voltage of the power sup-
ply terminal block (TB1).
Check the fuses on the main board
(F1 and F2).
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.