Mitsubishi Electric CMB-WM108V-AA Service Handbook page 198

[ VIII Troubleshooting ]
1) Check the self-diagnosis switch (Outdoor control board SW4 (SW6-10:OFF)).
Measurement data
Outdoor high pressure
Outdoor low pressure
ON
2 3 4 5 6 7 8 9 10
1
2) Check CNP1 connector on the HBC controller control board for proper connections.
3) Check the pressure value on the self-diagnosis switch (same as note 2) with the connector of the applied pressure sensor is
disconnected from the board.
HWE1708A
Symbol SW4 setting value
ON
63HS1
1 2 3 4 5 6 7 8
ON
63LS
1 2 3 4 5 6 7 8
The figure at left shows that the switches 1 through 5 are set to ON and 6 through 10 are set to OFF.
9 10
9 10
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