Mitsubishi Electric MSC-A07WV Service Manual page 106

MXZ-A18WV -
E1
Operation start
Check the outdoor unit
LED indicator.
OFF
J Check of power supply
See page 119.
• Indoor unit • COOL or
serial signal HEAT
error operation only
K Check of L Check of
serial signal R.V.coil
See page 119. See page 120.
Both LED 1 and
LED 2 lighting
• When cooling, heat
exchanger of
non-operating indoor
unit frosts.
•When heating, non-
operating indoor unit
gets warm.
M Check of LEV
See page 121.
• When cooling, • When heating,
dew drops in the room does not get
non-operating warm.
N Check of
indoor unit.
Check of mis- inverter, compressor
piping See page 121.
Check mis-piping,
shortage of capacity
106
LED 1 or LED 2
has blinked.
Refer to indicator list
on page 108, 109.
• When cooling,
room does not
cool.
N Check of
inverter,
compressor
See page 121.