Daikin VRV X RXQ6-48ANR Series, Service Manual

Page: 201 / 297

SiME341909EA Troubleshooting by Error Code
Part 6 Service Diagnosis 195
5.25 Activation of High Pressure Switch
Applicable
Models
All outdoor unit models
Error Code
E3
Method of Error
Detection
Detect continuity across the high pressure switch in the protection device circuit.
Error Decision
Conditions
When part of the protection device circuit opens.
(Reference) Operating pressure of the high pressure switch:
 Operating pressure: 4.0 MPa
 Resetting pressure: 3.0 MPa
Supposed
Causes
 Activation of high pressure switch
 Defective high pressure switch
 Defective outdoor unit main PCB
 Momentary power failure

Defective high pressure sensor
Troubleshooting
NO
YES
YES
Replace the high pressure
switch.
RXQ6-12AR: S1PH
RXQ14/16AR: S1PH, S2PH
Remedy defective points.
Replace the high pressure sensor
(S1PH).
YES
Are the
above 3 points
OK?
Does the error E3
recur?
NO
Is the
operating
pressure of the
high pressure switch
normal
(4.0 MPa)?
NO
YES
A
NO
(1) Mount a pressure gauge on the high pressure
service port.
(2) Reset the operation using the remote controller,
and then restart the operation.
Go to the next page
(
∗
1) Use the table on CHECK 12
to convert the voltage measurement
into pressure measurement.
CHECK 12
Compare the voltage
measurement of the connector
of the pressure sensor (
∗
1) with the
measurement of the pressure gauge.
Are the characteristics
of the high pressure
sensor
normal?
Check for the following 3 points:
(1) Is the stop valve open?
(2) Is the high pressure switch connector properly
connected to the outdoor unit main PCB?
(3) Is there continuity across the high pressure
switch?
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.