Mitsubishi Electric MSZ-LN18VGW-E1 Service Manual page 24

2. Flow chart of AIR PURIFYING power failure mode and i-see SENSOR failure mode recall function
Operational procedure
The air purifying device or i-see SENSOR might be abnormal.
Check if the air purifying device or i-see SENSOR is abnormal according to the following procedures.
Make sure that the remote controller is set to the failure mode
recall function.
With the remote controller headed towards the indoor unit, press TEMP
TEMP button to adjust the set temperature to 23 °C.*
Does POWER lamp on the indoor
unit blink at the interval of 0.5 seconds?
Blinks: The air purifying device is abnormal.
Beep is emitted at the same timing as the
blinking of POWER lamp.*2
The air purifying device or i-see SENSOR is abnormal.
Check the blinking pattern, and identify the abnormal point with
the table of AIR PURIFYING power or i-see SENSOR failure mode
recall function (10-2.5.).
Make sure to check at least 2 consecutive blinking cycles.*2
Releasing the failure mode recall function
Release the failure mode recall function by the following procedures.
Turn OFF the power supply and turn it ON again.
Press RESET button of the remote controller.
Deleting the memorized abnormal condition
After repairing the unit, recall the failure mode again according to
"Setting up the failure mode recall function" mentioned above.
Press STOP/OPERATE (OFF/ON) button of the remote controller (the set temperature is displayed) with the remote
controller headed towards the indoor unit.
Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.
Release the failure mode recall function according to "Releasing the failure mode recall function"
mentioned above.
Note1. Make sure to release the failure mode recall function after it is set up, otherwise the unit cannot operate properly.
2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.
*2.Blinking pattern when the air purifying device is abnormal:
Blinking at 0.5-
2.5-second OFF second interval
ON
OFF
Repeated cycle
3. AIR PURIFYING power operation check
AIR PURIFYING power goes ON when PURIFIER button on the remote controller is pressed
with any set temperature displayed during failure mode recall function.
Check the operation display section of the remote controller to confirm that AIR PURIFYING power is activated.
While AIR PURIFYING lamp stays OFF, it means normal.
Flashing AIR PURIFYING lamp means abnormal, the AIR PURIFYING power is not conducted.
AIR PURIFYING lamp
Continuously blinking Follow "Check of AIR PURIFYING power" to identify the error. (Refer to 10-6. .)
AIR PURIFYING power control circuit on the indoor electronic control P.C. board is out of order.
2-time flash
(Refer to 10-6. .)
NOTE: Perform the above mentioned check with the front panel closed. The interlock switch (Air purifying device) works by
opening front panel and the AIR PURIFYING power is cut.
OBH766B
Yes
(Blinks)
Repair the failure parts.
Blinking at 0.5-
2.5-second OFF second interval
Beeps
Repeated cycle
or
*1. Regardless of normal or abnormal condition, a short
No
(OFF)
The air purifying device and i-see SENSOR are normal.
Release the failure mode recall function according to the left
mentioned procedure.
Beeps Beeps
Repeated cycle
Remedy
24
beep is emitted as the signal is received.