Actuation Of High Pressure Switch - Daikin VRV-WIII RWEYQ72PTJU Service Manual

Troubleshooting by Indication on the Remote Controller

3.19 Actuation of High Pressure Switch

E3
Error Code
Applicable RWEYQ72P, 84P
Models
Method of Error
The error is detected by the protection device circuit that detects continuity at high pressure switch.
Detection
Error Decision
When the protector circuit is partially opened
(Reference) Operating pressure of high pressure switch
Conditions
 Actuation of condensing unit high pressure switch
Supposed
 Defective high pressure switch
Causes
 Defective condensing unit main PCB (A1P)
 Instantaneous power failure
 Defective high pressure sensor
Troubleshooting
182
Operating pressure: 580 psi
Reset pressure: 435 psi
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Check for the points shown below.
Is the stop valve open?
Is the high pressure switch connector properly
connected to the condensing unit main PCB?
Does the high pressure switch have continuity?
Are the 3 points NO
above OK?
YES
Mount a pressure gauge on the high pressure
service port.
Reset the operation using the remote
controller, and then restart the operation.
Does the stop
YES
due to error "E3" recur?
NO
Are the
characteristics of
NO
the high pressure sensor
normal?
(*1.)
YES
A
Is the
high pressure
NO
switch operating value
normal (i.e., 580
psi)?
YES
SiUS30-1301
Rectify the defective points, if
any.
Replace the high pressure switch.
Replace the high pressure sensor.
Service Diagnosis