Mitsubishi Electric Mr.SLIM SFZ Series Technical & Service Manual page 35

[ IX TROUBLESHOOTING ]
• If the unit cannot be operated properly after the test run has been performed, refer to the following table to remove the cause.
Wired remote controller
PLEASE WAIT
PLEASE WAIT Error code
Display messages do not
appear even when operation
switch is turned ON (operation
lamp does not light up).
On the wireless remote controller with condition above, following phenomena take place.
• No signals from the remote controller are accepted.
• Operation lamp is blinking.
• The buzzer makes a short piping sound.
Note:
Operation is not possible for about 30 seconds after cancellation of function selection. (Correct operation)
For description of each LED (LED1, 2, 3) provided on the indoor controller, refer to the following table.
LED1 (power for microcomputer)
LED2 (power for remote controller)
LED3 (communication between indoor and
outdoor units)
Wireless remote controller
(1) Turn on the power to the unit at least 12 hours before the test run.
(2) Press the TEST RUN button
(Start this operation from the status of remote controller display turned off.)
and current operation mode are displayed.
TEST RUN
(3) Press the MODE button
(4) Press the MODE button
(5) Press the FAN button
(6) Press the VANE button
(7) Press the ON/OFF button to stop the test run.
Note:
• Point the remote controller towards the indoor unit receiver while following steps (2) to (7).
• It is not possible to run in the FAN, DRY or AUTO mode.
HWE1909A
Symptom
LED 1, 2 (PCB in outdoor unit)
After LED 1, 2 are lighted, LED 2 is
For about 3
minutes after turned off, then only LED 1 is
lighted. (Correct operation)
power-on
Only LED 1 is lighted.
After about 3
minutes has
expired after
Only LED 1 is lighted.
power-on
Indicates whether control power is supplied. Make sure that this LED is
always lit.
Indicates whether power is supplied to the remote controller.
This LED lights only in the case of the indoor unit which is connected
to the outdoor unit refrigerant address "0".
Indicates state of communication between the indoor and outdoor units.
Make sure that this LED is always blinking.
twice continuously.
A
to activate COOL mode, then check whether cool air is blown out from the unit.
B
to activate HEAT mode, then check whether warm air is blown out from the unit.
B
and check whether fan speed changes.
C
and check whether the auto vane operates properly.
D
LED 1, 2 blink.
LED 1 blinks twice,
LED 2 blinks once.
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Cause
• For about 3 minutes after power-on,
operation of the remote controller is
not possible due to system start-up.
(Correct operation)
• Connector for the outdoor unit's
protection device is not connected.
• Reverse or open phase wiring for the
outdoor unit's power terminal block
(L1, L2, L3)
• Incorrect wiring between indoor and
outdoor units (incorrect polarity of
S1, S2, S3)
• Remote controller wire short
GB