Daikin REYQ-XA, Service Manual

Page: 306 / 441

Troubleshooting by Error Code SiUS371901E
293 Service Diagnosis
3.33 Activation of High Pressure Switch
Error Code
E3
Applicable
Models
All outdoor unit models
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 (580 psi)
„
Resetting pressure: 3.0 MPa (435 psi)
Supposed
Causes
„
Activation of high pressure switch
„
Defective high pressure switch
„
Defective outdoor unit main PCB (A1P)
„
Momentary power failure
„
Defective high pressure sensor
Troubleshooting
NO
YES
YES
Replace the high pressure
switch (S1PH).
Remedy defective points.
Replace the high pressure sensor
(S1NPH).
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
(580 psi))?
NO
YES
Are the
characteristics of
the high pressure
sensor normal?
(
∗
1)
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.
A
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.
Go to the next page.