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[F23] Low pressure sensor error
[F30] Enhanced IC error
Enhanced IC on water heat exchanger control board is abnormal.
Check water heat exchange control board.
If defective, replace it.
PC board
MCC-1753
Attach low pressure sensor
Replace low pressure sensor
Yes
No
Low pressure sensor
is detached (CN607)
No
When operation
is stopped, low pressure sensor
is normal *1
Yes
Start
Check water heat exchange control board
If defective, replace it
PC board
MCC-1753
*1 How to determine: When operation is stopped
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