Service manual

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(V2791)
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Caution
Low pressure at stop
due to malfunction is
0.15 MPa.
Out of gas, refrigerant system
clogging, wiring and piping wrong
connection, stop valve closed,
electronic expantion valve fully
close malfunction.
Replace the low pressure sensor.
Replace outdoor unit PC board
A1P.
Is stop valve opened?
Open stop valve.
Measure
the voltage (VL)
of X45A pin No. (2) -
(3) of outdoor PC board
(A2P).∗1
Is the relationship between
low voltage and VL
normal?
NO
NO
NO
YES
YES
YES
4
3
2
1
Outdoor unit PC board A1P
*2 Measure voltage (DC) within this space.
GND
+5V
Red
Black
White
Low pressure sensor
(V2792)
Microcomputer
A/D input
X45A
(blue)