Daikin RZQ100B8V3B Service Manual page 209

ESIE05-03
3.4 Actuation of Low Pressure Sensor: RZQ71B8V3B (E4)
E4
Remote Controller
Display
Method of Actual value of the low pressure is continuously measured using 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
Part 3 – Troubleshooting
Abnormal drop of low pressure (Lower than 0.15MPa)
Defect of low pressure sensor
Defect of outdoor unit PC board
Stop valve is not opened.
Is stop
valve opened?
YES
Low
pressure at stop YES
due to malfunction is
0.15 MPa.
NO
Measure
the voltage (VL)
of X64A pin No. (2) - (3)
YES
of outdoor PC board (A1P).∗1
Is the relationship between
low voltage and VL
normal?
NO
NO
Error Codes: Outdoor Units
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.
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