Mitsubishi Electric PUHY-M200YNW-A1 Service Handbook page 290

[8-9 Troubleshooting Problems with Major Components on Hydro unit ]
1) Check the self-diagnosis switch (Outdoor control board SW4 (SW6-10:OFF)).
Measurement data Symbol
Outdoor high pressure 63HS1
Outdoor low pressure 63LS
ON
1 2 3 4 5 6 7 8 9 10
2) Check CNP1 connector on the Hydro unit 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.
BS_08_E
SW4 setting value
ON
1 2 3 4 5 6 7 8 9 10
ON
1 2 3 4 5 6 7 8 9 10
The figure at left shows that the switches 1 through 5 are set to ON and 6 through 10 are set to OFF.
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