Manualshelf

MXZ-SM42NAMHZ Service Manual

ManualsBrandsMitsubishi ManualsCoolingOne-Way Ceiling 4-Zone H2i System - 42,000 BTU Outdoor - 9k + 12k + 12k + 12k Indoor - 22.0 SEER
61626364656667686970
66
OCH789
Check code
1500
(U7)
Superheat due to low discharge temperature trouble
●Diagnosis of defects
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Diagnosis Remedy
Chart 2 of 2
*For the voltage, refer to "8-8.HOW TO
CHECK THE COMPONENTS".
No
No
Yes
Yes
No
Yes
Continued from the previous page.
Is the voltage normal?
Is it free from any trace of over-
heating or burning?
Is the voltage(*) detected?
Replace the indoor controller board.
Replace the 63HS.
Replace the outdoor controller board.
Check the voltage and appearance of the
indoor controller board.
Check the 63HS voltage.
Is the resistance detected?
Replace the indoor LEV.