Actuation Of Low Pressure Sensor - Daikin RXYQ-TA Series Service Manual

Troubleshooting by Error Code

3.30 Actuation of Low Pressure Sensor

E4
Error Code
Applicable
All outdoor unit models
Models
Method of Error
Make judgement of pressure detected by the low pressure sensor with the outdoor unit main PCB.
Detection
Error Decision When low pressure caused a drop while the compressor is in operation:
Conditions
Supposed
Causes
Troubleshooting
217
Operating pressure: 0.07 MPa (10.2 psi)
Abnormally drop in low pressure
Defective low pressure sensor
Defective outdoor unit main PCB
The stop valve is not opened
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Is the stop
valve open?
YES
(1)Mount a pressure gauge on the low pressure
service port.
(2)Reset the operation using the remote
controller, and then restart the operation.
Are the
characteristics
of the low pressure
sensor normal?
(∗1)
YES
Service Checker CHECK 12
Compare the low pressure value checked with the Service Checker and the
actual value measured by pressure sensor (∗1).
Check if
the low
pressure value
and the actual value
measured by
pressure sensor
are the
same.
YES
- The low pressure sensor is normal, and pressure detection with the
outdoor unit main PCB is also normal.
- The low pressure has really become low.
: Eliminate factors that cause the low pressure to decrease.
CHECK 2
NO
Open the stop valve.
NO
Replace the low pressure sensor
(S1NPL).
NO
Replace the outdoor unit main
PCB (A1P).
SiUS341615E
Service Diagnosis