Mitsubishi Electric MFZ-KA25VA Service Manual page 32

When the left lamp of OPERATION INDICATOR lamp flashes 15-time.
Indoor unit and outdoor unit do not operate.
Check of damper
E
After performing the check, make sure to release the failure mode recall function.
Turn OFF the power supply.
Is there anything that interferes the opening
or closing movement of the damper?
Turn ON the power supply.
< Set up the failure mode recall function >
Turn ON the power supply.
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.
Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature
is displayed) with the remote controller headed towards the indoor unit. W1
With the remote controller headed towards the indoor unit,
press VANE CONTROL button.
Does the damper open and close?
(Normally, the damper opens and closes
each time VANE CONTROL button is pressed.)
Turn OFF the power supply.
Measure the resistance according to 10-5.
1.Measure the resistance of the damper lock motors (ML1, ML2).
2.Measure the resistance of the damper motor (MV2).
No
Is the resistance value normal each?
Replace the motor Replace the indoor
that indicates the electronic control
abnormal value. P.C. board.
Yes
Remove the object.
No
Yes
No
Yes
1 While pressing both OPERATION SELECT
2 First, release RESET button.
W1. Regardless of normal or abnormal, a short
Fuse (F11)
VARISTOR (NR11)
Make the damper open by pressing
VANE CONTROL button.
1) Measure the voltage between CN1X1 1(+) and 2(-).
2) Measure the voltage between CN1Y1 1(+) and 3(-).
1) Is there 0V DC between CN1X1 1(+) and 2(-)?
2) Is there 5V DC between CN1Y1 1(+) and 3(-)?
Yes Yes
Make the damper close by pressing
VANE CONTROL button.
1) Measure the voltage between CN1X1 1(+) and 2(-).
2) Measure the voltage between CN1Y1 1(+) and 3(-).
1) Is there 5V DC between CN1X1 1(+) and 2(-)?
2) Is there 0V DC between CN1Y1 1(+) and 3(-)?
Yes Yes
Replace the indoor electronic control
P.C. board.
32
button and TOO COOL button on the remote controller
at the same time, press 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.
beep is emitted once as the signal is received.
Indoor electronic
control P.C. Board
JR06
JR05
IC101
CN1X1 CN1Y1
C111 T11
R111
1) No
Replace either or both damper
limit switches (open, close) as
follows.
1) No : Replace the damper
2) No
limit switch (open) .
2) No : Replace the damper
limit switch (close) .
1) No
Replace either or both damper
limit switches (open, close) as
follows.
1) No : Replace the damper
2) No
limit switch (open) .
2) No : Replace the damper
limit switch (close) .
CN151
CN152
CN211
CN212