Si20-701_B Troubleshooting by Remote Controller
260
Troubleshooting
∗1: Voltage measurement point
∗2: Refer to pressure sensor, pressure/voltage
characteristics table on P.471.
The low
pressure sensor is
connected to the
outdoor unit
PCB.
NO
YES
NO
The
relationship
between the
(∗1) VH and low
pressure is normal (∗2)
when voltage is
measured between
pins (2) and (3)
of outdoor
unit PCB
(∗1).
Connect low
pressure sensor
properly and
restart system.
Caution
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
may be damaged.
YES
Replace the
outdoor unit
PCB.
Replace the low
pressure sensor.
Outdoor unit PCB
Low pressure sensor
Micro-computer
A/D input
GND
+5V
Red
Black
White
(4)
(3)
(2)
(1)
∗2 Measure voltage here.
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