E4" Outdoor Unit: Actuation Of Low Pressure Sensor; Actuation Of Low Pressure Sensor - Daikin REYQ72 Serveice Manual

Troubleshooting by Indication on the Remote Controller
2.15 " E4 " Outdoor Unit:
E4
Remote Controller
Display
Applicable Models REYQ72M, 96M
Method of Abnormality is detected by the pressure value with the low pressure sensor.
Malfunction
Detection
Malfunction Error is generated when the low pressure is dropped under specific pressure.
Decision
Conditions
Supposed
Causes
Troubleshooting
∗
1: Voltage measurement point
∗
1: Refer to pressure sensor, pressure / voltage characteristics table on P.241.
144

Actuation of Low Pressure Sensor

Abnormal drop of low pressure (Lower than 21psi)
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.
Is stop valve opened?
YES
Low pressure
at stop due to malfunction
is 21psi.
NO
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
YES
YES
SiUS39-602
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).
(V2791)
Troubleshooting