SiME332106E
Troubleshooting by Error Code
Part 6 Service Diagnosis
199
Reference
Reference
5.26 Activation of Low Pressure Sensor
Applicable
Models
All outdoor unit models
Error Code
E4
Method of Error
Detection
Make judgment of pressure detected by the low pressure sensor with the outdoor unit main
PCB.
Error Decision
Conditions
When low pressure caused a drop while the compressor is in operation:
Operating pressure: 0.07 MPa
Supposed
Causes
Abnormally drop in low pressure
Defective low pressure sensor
Defective outdoor unit main PCB
The stop valve is not opened
Troubleshooting
CHECK 2
Refer to page 272.
CHECK 12
Refer to page 284.
YES
NO
NO
YES
NO
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.
Is the stop
valve open?
- The low pressure sensor is normal, and outdoor unit main PCB is
also normal.
- The low pressure has really become low.
Replace the outdoor unit main
PCB (A1P).
Replace the low pressure sensor.
(S1NPL)
Open the stop valve.
CHECK 2
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Eliminate factors that cause the low pressure to decrease.
CHECK 12
(
1) Use the table on
CHECK 12
to
convert the voltage measurement into
pressure measurement.
Compare the
voltage measurement of
the connector of the pressure
sensor (
1) with the measurement
of the pressure gauge.
Are the characteristics of the
low pressure sensor
normal?
Connect the service checker, and then compare the low pressure value
measured by the service checker with the voltage measurement of the
connector of the pressure sensor (
1)
Service Checker
CHECK 12
Are both
pressure values the
same?
