Daikin SkyAir RZQ-P Series Service Manual page 134

Troubleshooting by Indication on the Remote Controller
Troubleshooting
1: Voltage measurement point
Refer to "Pressure Sensor, Pressure / Voltage Characteristics" table on P.163.
126
Be sure to turn off the power switch before connecting or disconnecting
Caution the connector or parts may be damaged.
The low
pressure sensor is
NO
connected to X18A of
outdoor unit PCB
(A1P).
YES
The
relationship
between the VL
and low pressure is
normal (see *1) when voltage
YES
is measured between X18A
pins (2) and (3) of
outdoor unit PCB
(A1P)
NO
Outdoor unit PCB A1P
GND
Micro-computer
A/D input
Measure DC voltage here.
Connect the low pressure sensor
property and turn ON again.
Replace the outdoor unit PCB
(A1P).
Replace the low pressure sensor.
+5V
X18A
Red
Black
White
SiUS28-902_B
Service Diagnosis