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18.4.28 F99 (DC Peak Detection)
Malfunction Decision Conditions
During startup and operation of cooling and heating, when inverter DC peak data is received by the outdoor internal
DC Peak sensing circuitry.
Malfunction Caused
During startup and operation of cooling and heating, when inverter DC peak data is received by the outdoor internal
DC Peak sensing circuitry.
Malfunction Caused
DC current peak due to compressor failure.
DC current peak due to defective power transistor(s).
DC current peak due to defective outdoor unit PCB.
DC current peak due to short circuit.
Troubleshooting
Troubleshooting
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19. Disassembly and Assembly Instructions
WARNING
High Voltage is generated in the electrical parts area by the capacitor. Ensure that the capacitor has discharged sufficiently before proceeding
with repair work. Failure to heed this caution may result in electric shocks.
with repair work. Failure to heed this caution may result in electric shocks.
19.1 Indoor Electronic Controllers, Cross Flow Fan and Indoor Fan Motor
Removal Procedures
19.1.1 To Remove Front Grille
3 Hold both sides of the front grille and
remove it by pulling up and toward
yourself gently.
remove it by pulling up and toward
yourself gently.
1 Lift to open the horizontal vane
gently.
gently.
2 Remove 2 caps and 3 screws at the
bottom of discharge vane.
bottom of discharge vane.
Figure 1
19.1.2 To Remove Power Electronic Controller
4 Removing the control
board cover by
releasing the hook.
board cover by
releasing the hook.
Hook
Figure 2
127
AC303
CN-STM3
CN-STM1
CN-TH
CN-FM
8 Pull out the main
electronic controller
halfway.
electronic controller
halfway.
9 Detach connectors as labeled from the
electronic controller. Then pull out main
controller gently.
electronic controller. Then pull out main
controller gently.
5 Detach the Earth wire
screw, lead wires AC306
(Black) and AC304 (Red)
from the terminal board.
screw, lead wires AC306
(Black) and AC304 (Red)
from the terminal board.
7 Remove screw to remove
terminal board complete.
terminal board complete.
6 Detach the CN-DISP
connector then remove
the indicator complete.
connector then remove
the indicator complete.
Figure
3 Figure
4
19.1.3 To Remove Discharge Grille
10 Pull cut to remove the drain
hose from the discharge grille
11 Then pull the discharge grille
downward gently to dismantle it.
downward gently to dismantle it.
Discharge Grille
Figure 5
128
19.1.4 To Remove Control Board
Figure 6
19.1.5 To Remove Cross Flow Fan and Indoor Fan Motor
Figure 7
15 Remove the bearing by pulling it out gently.
14 Remove the 2 screw from the evaporator
Figure 8
