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: Check Indoor unit
Is the input voltage of IC2 about DC22V?
NO
Exchange TR01 and ZD01.
YES
NO
Is the output of IC2 DC12V? Exchange IC2.
YES NO
Is the output of IC3 DC5V?
Exchange IC3.
YES NO
Is the output of NO.43 pin of IC1 DC5V?
Exchange IC4.
YES
Is the connection between main P.C.B and CN-Display P.C.B correct?
NO
Connect correctly.
YES
Is the output of NO.64 pin of IC1 DC5V?
NO
Check P.C.B pattern.
YES
Exchange IC1.
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