Mitsubishi Electric MSZ-FD25VA Service Manual page 32

All lamps flash ON and OFF every 0.5-second.
Indoor unit and outdoor unit do not operate.
Check of installation of the horizontal vane
E
Turn OFF the
power supply.
Is the stopper of the horizontal vane
locked to the indoor unit correctly?
Yes
To check the continuity of the interlock switch
(Fan), measure the resistance of connector 1 - 2
connected to CN1R1 on the indoor electronic
control P.C. board.
Is there resistance 0 "?
Yes
Replace the
indoor electronic
control P.C. board.
PLASMA lamp flashes 2-time.
POWER lamp flashes 1 to 5 times while PLASMA operation failure mode (Refer to 10-2.5) is recalled.
F
Check of PLASMA operation
After performing the check, make sure to release the failure mode recall function.
Turn ON the power supply.
Does PLASMA lamp flash
2-time with unit stopping?
1 While pressing both OPERATION SELECT button and
TOO COOL button on the remote controller at the same time,
press RESET button.
2 First, release RESET button.
And release the other two buttons after all LCD except the set
temperature in operation display section of the remote
controller is displayed after 3 seconds.
3 Press OPERATE/STOP (ON/OFF) button (the set temperature
is displayed)
4 And press PLASMA button once with the remote controller
headed towards the indoor unit. w1
PLASMA operation is selected.
wThe plasma operation check mode is set.(Refer to 10-2.5.)
Does PLASMA lamp stay OFF, or continuously
blink?
Replace the PLASMA POWER P.C. board.
No
Relock the stopper of the
horizontal vane to the indoor unit.
(Refer to 10-1.5.)
Turn ON the
power supply.
Are all lamps flashing?
Turn OFF the
power supply.
No( )
Replace the
interlock switch(Fan).
Yes
No
OFF
Continuously blinking.
No
OK
Yes
High voltage (approx. -4.4 kV) is generated during PLASMA
operation.
Pay careful attention and never touch PLASMA ELECTRODE
UNIT and the high-voltage lead part (red wire).
Replace the indoor electronic control P.C. board.
PLASMA
operation
Normal
w2 Turn PLASMA operation OFF and ON again.
(For turning OFF PLASMA operation, refer to 10-2.3.)
(If it goes normal without turning OFF and ON, PLASMA lamp doesn't go OFF.)
32
w1 Regardless of normal or abnormal condition,
a short beep is emitted once the signal
is received.