Troubleshooting - Mitsubishi Mr.SLIM PUH18EK Technical & Service Manual

11

TROUBLESHOOTING

1. SERVICE DATA INDICATION BY SWITCHES ON OUTDOOR CONTROLLER BOARD
Setting dip switches 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 independent 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
alternately.
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 OFF
SW3-2 OFF
LED Blinking
LD1 Reversed phase
LD2 Open phase
Outdoor coil thermistor
LD3
is abnomal.
LD4 63H2 function
LD5 51C function
LD6 26C function
LD7 Overheat protection
Input circuit on controller
LD8
board is abnormal
Output state
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
20
Outdoor coil Fan output
temperature 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