Service manual

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(V2819)
The suction pipe
temperature minus coil
temperature is 20 °C
or higher.
Resistance
is normal when
measured with the
suction pipe thermistor
(R2T) and coil thermistor
(R4T) disconnected
from the outdoor
unit PC
board.
*1
Out of gas or refrigerant
system is clogged. Requires
check of refrigerant system.
Replace the thermistor.
Replace the outdoor unit PC
board (A1P).
YES
NO
NO
Out of gas, closing of stop
valve or refrigerant system is
clogged. Requires check of
refrigerant system.
Replace main outdoor unit
PC board (A1P).
YES
YES
NO
Cooling
Low pressure is
0.1 MPa or less.
The
voltage of
X45A pins (2)
and (3) on main
outdoor unit PC
board(A1P) is 0.8 VDC or
less. (Low pressure
sensor output
voltage)
∗2
NO
NO
YES
YES
Replace low pressure sensor.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.