Mitsubishi Electric MXZ-SM72TAM-U1 Service Manual page 40

1302 (UE): High pressure trouble
Diagnosis of failure
Continued from the previous page.
Is the resistance detected?
Disconnect the indoor LEV wiring to check the
resistance.
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 resistance of SV1.
Continue to the next page.
*For the voltage, refer to "How to check the components".
OCH800A_40
No
Yes
No
Yes
No
Yes
Replace the TH7.
Replace the indoor LEV.
Replace the indoor controller board.
Chart 3 of 4