Mitsubishi Electric MXZ-2D33VA, Service Manual

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The record of automatic line correcting can be checked in the following way:
(1) Turn OFF the power supply and make sure that the LED goes off.
(2) Turn ON the "3" of SW2 on the outdoor display P.C. board.
(3) Turn ON the power supply.
(4) Check the correction state with the LED lamps on the outdoor display P.C. board.
(5) Turn OFF the power supply and make sure that the LED goes off.
(6) Turn OFF the "3" of SW2 on the outdoor display P.C. board.
(7) Turn ON the power supply.
Number of blinks
Wiring line
LED1 (Red) LED2 (Yellow)
Once Once Not corrected
3 times 3 times Corrected
SW2
<MXZ-3D54VA/3D54VA2/3D68VA/4D72VA/4D83VA/5D102VA>
Improper wiring or piping can be automatically detected by pressing the piping/wiring correction switch (SW871) on the
outdoor control P.C. board.
When improper wiring or piping is detected, wiring lines are corrected.
This will be completed in about 10 to 20 minutes.
[How to activate this function]
1. Check that outside temperature is above 0ºC.
(This function does not work when outside temperature is not above 0ºC.)
2. Check that the stop valves of the liquid pipe and gas pipe are open.
3. Check that the wiring between indoor and outdoor unit is correct.
(If the wiring is not correct, this function does not work.)
4. Turn ON the power supply and wait at least 1 minute.
5. Press the piping/wiring correction switch (SW871) on the outdoor P.C. board.
Do not touch energized parts.
LED indication during detection:
LED1 (Red) LED2 (Yellow) LED3 (Green)
Lighted Lighted Once
LED indication after detection:
LED1 (Red) LED2 (Yellow) LED3 (Green) Indication
Lighted Not lighted Lighted Completed (Problem corrected/Normal)
Once Once Once Not completed (Detection failed)
Other indications
Refer to "SAFETY PRECAUTIONS WHEN LED
FLASHES" located behind the service panel.
Make sure that the valves are open and the pipes are not collapsed or clogged.
6. Press the switch to cancel.
LED indication after cancel:
LED1 (Red) LED2 (Yellow) LED3 (Green)
Lighted Lighted Not lighted
NOTE:
Indoor unit cannot be operated while this function is activated.
When this function is activated while indoor unit is operating, the operation will be stopped.
Operate indoor unit after the automatic line correcting is finished.
Pressing the switch during detection cancels this function.
The record of automatic line correcting can be checked in the following way:
Press the switch for more than 5 seconds
LED will show the record of automatic correcting for about 30 seconds as shown in the table below:
Number of blinks
Wiring line
LED1 (Red) LED2 (Yellow) LED3 (Green)
Once Once Lighted Not corrected
3 times 3 times Lighted Corrected
NOTE:
Activate this function to check the correct wiring after replacing the outdoor P.C. board.
(Previous records are deleted when the outdoor control P.C. board is replaced.)
The record cannot be shown if automatic line correcting is not cancelled (Refer to "How to activate this function").
MXZ-2D33VA/2D40VA/2D42VA/2D42VA2
MXZ-2D53VA/2D53VA2/2D53VAH/2D53VAH2
SW2 on the outdoor display P.C. board
OBH626K