E4" Outdoor Unit: Actuation Of Low Pressure Sensor - Daikin VRV II RXYQ5MY1B Service Manual

Troubleshooting by Indication on the Remote Controller

2.15 "E4" Outdoor Unit: Actuation of Low Pressure Sensor

E4
Remote
Controller
Display
Applicable RXYQ5~48M
Models
Method of
Malfunction
Detection
Malfunction Error is generated when the low pressure is dropped under specific pressure.
Decision
Conditions
Supposed
Causes
Troubleshooting
of outdoor PC board (A2P).∗1
∗1: Voltage measurement point
∗2: Refer to pressure sensor, pressure / voltage characteristics table on P313.
190
Abnormal drop of low pressure (Lower than 0.07MPa)
Defect of low pressure sensor
Defect of outdoor unit PC board
Stop valve is not opened.
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
NO
Is stop valve opened?
YES
Low pressure
YES
at stop due to malfunction
is 0.07 MPa.
NO
Measure
the voltage (VL)
of X45A pin No. (2) - (3)
YES
Is the relationship
between low
voltage and VL
normal?
NO
Outdoor unit PC board A1P
Microcomputer
A/D input
*2 Measure voltage (DC) within this space.
+5V
GND
Open stop valve.
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.
X45A
(blue)
Red
Black
White
(V2792)
Troubleshooting
SiE39-404
(V2791)