Mitsubishi Electric MXZ-2D33VA-E1 Service Manual page 72

11-3. INSTRUCTION OF TROUBLESHOOTING
• Check the indoor unit by referring to the indoor unit service manual, and confirm whether there is any problem in the indoor
unit.
Then, check the outdoor unit by referring to this page.
Both LED 1
and LED 2
are OFF.
Refer to 11-6.
"Check of power supply".
• Indoor unit • COOL or HEAT
serial signal operation only
error Refer to 11-6.
Refer to 11-6. "Check of
"How to R.V. coil"
check
miswiring
and serial
signal error".
OBH626B
Operation start
Check the outdoor unit
LED indicator.
Both LED 1 and
LED 2 are lighting.
• When cooling, heat
exchanger of non-
operating indoor unit
frosts.
• When heating, non
operating indoor unit
gets warm.
Refer to 11-6.
"Check of LEV".
• When cooling, dew • When heating, room
drops in the non- does not get warm.
operating indoor • When cooling,
unit. room does not cool.
Check of mispiping Refer to 11-6.
"How to check of
inverter/compressor".
Check mispiping,
shortage of capacity
72
LED 1 or LED 2
has blinked.
Refer to 11-4.
"Troubleshooting check table".