Mitsubishi Electric MXZ-SM36NAM2 Technical & Service Manual page 63

Check code
1302
(UE)
●Diagnosis of defects
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Continued from the previous page.
Is the resistance detected?
Is the connector for outdoor
controller board 63H disconnected or
loose?
Check the 63HS voltage.
Is the voltage(*) detected?
Disconnect the TH4 wiring and
check the resistance
Is the resistance detected?
Is there refrigerant leak?
OCH810A
High pressure trouble or thermal protector trouble
Diagnosis
Yes
No
Yes
Yes
No
*For the voltage, refer to "8-8.HOW TO
CHECK COMPONENTS".
No
Reconnect the connector or connect it tightly.
Yes
No
No
Repair the refrigerant leakage.
Yes
Replace the outdoor controller board.
63
Chart 4 of 4
Remedy
Replace the SV1.
Replace the 63HS.
Replace the TH4.