Indoor Unit - Mitsubishi Electric MSZ-FD25VA Service Manual

E Check of installation of the horizontal vane
Turn OFF the power supply.
Is the stopper of the horizontal vane
locked to the indoor unit correctly?
To check the continuity of the interlock
switch (Fan), measure the resistance of
connector - connected to CN1R1 on
the indoor electronic control P.C. board.
Is there resistance 0 Ω?
Yes
Replace the indoor electronic
control P.C. board.
F Check of PLASMA operation
Turn ON the power supply.
Does PLASMA lamp flash
2-time with unit stopping?
While pressing both OPERATION SELECT button and TOO
COOL button on the remote controller at the same time,
press RESET button.
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.
Press OPERATE/STOP (ON/OFF) button (the set tempera-
ture is displayed)
And press PLASMA button once with the remote controller
headed towards the indoor unit. 1
PLASMA operation is selected.
The plasma operation check mode is set. (Refer to 10-2.5.)
Does PLASMA lamp stay OFF, or continu-
ously blink?
Replace the PLASMA POWER P.C. board.
Re-lock the stopper of the hori-
zontal vane to the indoor unit.
No
(Refer to 10-1.5.)
Yes
Replace the interlock switch (Fan).
∞
No( )
Yes
No
OFF
Continuously blinking.
Are all lamps flashing?
Turn OFF the power supply.
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
2 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 does not go OFF.)
32
Turn ON the
power supply.
OK
No
Yes
1 Regardless of normal or abnormal condi-
tion, a short beep is emitted once the sig-
nal is received.