Mitsubishi Electric CITY MULTI PUMY-P200YKM2R2 Technical & Service Manual page 54

Check code
1501
(U2)
●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 63HS voltage.
Is the voltage(*) detected?
Check the voltage and appearance of the
outdoor controller board.
Is the voltage normal value?
Is it free from any trace of over-
heating or burning?
Disconnect the indoor LEV wiring and
check the resistance.
Is the resistance detected?
OCH675E
Refrigerant shortage trouble
Diagnosis
Yes
*For the voltage, refer to
Yes
"8-8. HOW TO CHECK THE
COMPONENTS".
Yes
Yes
No
No
Replace the outdoor controller board.
No
No
Replace the indoor controller board.
54
Chart 2 of 2
Remedy
Replace the thermistor.
Replace the 63HS.
Replace the indoor LEV.