Mitsubishi Electric Mr. Slim PLH Series Technical & Service Manual page 46

3.SERVICE DATA INDICATION BY SWITCHES ON OUTDOOR CONTROLLER BOARD
Setting dip switchs SW2 and SW3 on the outdoor controller board enables LED to show the output state and check code.
Output state is shown by LED lighting, and check code by blinking.
SW1 : Turning SW1 ON clears the check code. If SW1 is turned ON while the check code is blinking , the indication
changes to output state indication.
NOTE : SW1 is usually available independant of SW3 setting. As an exception, when the check code shows a
reversed phase or an open phase during the power-on-reset state, SW1 is not available.
SW2 : SW2 is turned ON by pressing, and OFF by releasing.
When SW3-1 and SW3-2 are OFF, pressing SW2 changes indication between output state and check code alternate-
ly.
When SW2 is turned On with SW3-1 OFF and SW3-2 ON, the compulsory defrosting starts.
SW3 : Output state indication items depend on the combination of SW3-1 ON/OFF and SW3-2 ON/OFF.
Changed alternately by pressing SW2.
Check code
SW3-1
SW3-2
LED Blinking
LD1 Reversed phase
LD2 Open phase
Outdoor coil thermistor is
LD3
abnormal.
LD4 63H2 function
LD5 51C function
LD6 26C function
LD7 Overheat protection
Input circuit on controller
LD8
board is abnormal
46
OFF
OFF
Compressor ON command
from indoor controller
Heating operation command
from indoor controller
During 63H1 function
Compressor ON
Outdoor fan ON
4-way valve ON
Bypass valve ON
Crankcase heater ON
Outdoor coil
temperature
Output state
OFF
OFF
Fan outpuit
step
(bit) (bit)
OFF ON
ON OFF
Lighting
1 1
2 2
4 4
8 8
16 16
32 32
64 64
128 128
Total time of
compressor
operation(Hr)
ON
ON
256
512
1024
2048
4096
8192
16384
32768