Mitsubishi Electric PUMY-P36NKMU3 Technical & Service Manual page 58

Check code
Superheat due to low discharge temperature trouble
1500
(U7)
●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?
Check the voltage and appearance of the
indoor controller board.
Is the voltage normal?
Is it free from any trace of over-
heating or burning?
Check the 63HS voltage.
Is the voltage(*) detected?
OCH733
Diagnosis
Yes
Yes
Yes
*For the voltage, refer to "8-8.HOW TO
CHECK THE COMPONENTS".
No
No Replace the indoor controller board.
No
Replace the outdoor controller board.
58
Chart 2 of 2
Remedy
Replace the indoor LEV.
Replace the 63HS.