Mitsubishi Electric MXZ-2B30VA Service Manual page 62

The record of auto line correcting can be confirmed in the following way:
Turn OFF the power supply.
Turn ON the "4" of SW1 on the display P.C. board.
Turn ON the power supply.
Confirm the correction by the blinking of LED.
Number of blinks
LED2 (Yellow)
LED1 (Red)
Once
3 times
3 times
Turn OFF the power supply after the confirmation, and turn OFF the 4th Dip Switch of SW1 on the display P.C. board.
Turn ON the power supply.
NOTE: This function does not work when the jumper wire JGO on the inverter P.C. board is cut.
<MXZ-4B80VA, MXZ-5B100VA>
Improper wiring or piping can be automatically detected by pressing the piping/wiring correction switch (SW871).
When improper wiring or piping is detected, wiring lines are corrected.
This will be completed in about 10 to 15 min.
[How to activate this function]
1. Check that outside temperature is above 0°C .
(This function does not work when outside temperature is not above 0°C.)
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 electronic control P.C. board.
Do not touch energized parts.
LED indication during detection:
LED1(Red) LED2(Yellow)
Lighting Lighting
LED indication after detection:
LED1(Red) LED2(Yellow)
Lighting Goes out
Blinking Blinking
Other indications
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)
Lighting Lighting
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 auto line correcting is finished.
Pressing the switch during detection cancels this function.
The record of auto line correcting can be confirmed in the following way:
Press the switch for more than 5 sec.
LED will show the record of auto correcting for about 30 sec. as shown in the table below:
Number of blinks
LED1(Red) LED2(Yellow)
Once Once
3 times 3 times
NOTE: Activate this function to confirm the correct wiring after replacing the electronic control P.C. board.
(Previous records are deleted when the electronic control P.C. board is replaced.)
The record cannot be shown if auto line correcting is not canceled (Refer to "How to activate this function").
OBH554D
Wiring line
Not corrected
Once
Corrected
LED3(Green)
Blinking
LED3(Green)
Lighting Completed (Detected successfully)
Blinking Cannot be corrected
Refer to"SAFETY PRECAUTIONS WHEN LED FLASHES" located behind the service panel.
LED3(Green)
Goes Out
Wiring line
LED3(Green)
Lighting Not corrected
Lighting Corrected
Indication
62
SW1
ON
MXZ-2B
SW871
SW871