Low Pressure Abnormality - Daikin RZQ Series FCQ20EVA Service Manual

SiME281501E

4.19 Low Pressure Abnormality

E4
Error Code
Applicable
RZQ
Models
Method of Error [In cooling]
 Detect error by the pressure sensor (S1NPH).
Detection
[In heating]
 Detect error by the intermediate heat exchanger thermistor (R5T).
Error Decision
[In cooling]
 When the detection pressure is the following value
Conditions
[In heating]
 When the saturated pressure equivalent to the detection temperature is the following value
 Stop valve is not opened.
Supposed
 Defective pressure sensor and intermittent harness
Causes
 Defective outdoor unit PCB
 Abnormal drop of low pressure
Troubleshooting
Caution Be sure to turn off the power switch before connecting or disconnecting connectors, or parts may be damaged.
Check the installation conditions
Is the stop valve open?
YES
A
Service Diagnosis
0.12MPa or less continues for 5 minutes
0.12MPa or less continues for 5 minutes
(Refrigerant shortage)
(Defective refrigerant piping system (liquid pipe system))
(Defective electronic expansion valve)
NO
Troubleshooting by Remote Controller
Open the stop valve.
110