Mitsubishi Electric MXZ-SM72TAM-U1 Service Manual page 43

1500 (U7): Superheat due to low discharge temperature trouble
Diagnosis of failure
Continued from the previous page.
Is the resistance detected?
Check the voltage and appearance of the indoor
controller board.
Is the voltage normal?
Is it free from any trace of overheating
or burning?
Check the 63HS voltage.
Is the voltage(*) detected?
*For the voltage, refer to "How to check the components".
OCH800A_43
No
Yes
No
Yes
No
Yes
Replace the indoor LEV.
Replace the indoor controller board.
Replace the 63HS.
Replace the outdoor multi controller circuit
board.
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