Mitsubishi Electric MXZ-3C24NA Service Manual page 62

11-3. INSTRUCTION OF TROUBLESHOOTING
• Check the indoor unit with referring to the indoor unit service manual, and confirm that there is any problem in the indoor
unit.
Then, check the outdoor unit with referring to this page.
Operation start
Check the outdoor unit
LED indicator.
Both LED1 and
LED2 are OFF.
Refer to 11-6.
"Check of power supply".
serial signal HEAT
error operation only
Refer to 11-6.
Refer to 11-6.
"How to "Check of
check R.V. coil".
miswiring and
serial signal
error".
OBH702A
Both LED 1 and
LED 2 are lighting.
exchanger of
non-operating indoor
unit frosts.
operating indoor unit
gets warm.
Refer to 11-6.
"Check of LEV".
dew drops in the
room does not get
non-operating warm.
indoor unit.
Refer to 11-6.
Check of "How to check
miss-piping. inverter/compressor".
shortage of capacity.
62
LED 1 or LED 2
has blinked.
Refer to 11-4.
"Troubleshooting check table".
room is not
cool.
Refer to 11-6.
"How to check
inverter/
compressor".