Daikin VRV RXYQ72-384XAYCA, Service Manual

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SiUS342004EB Troubleshooting by Error Code
Part 6 Service Diagnosis 284
3.34 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 (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 press u re
switch (S1PH).
Remedy defecti v e points.
YES
Are the
a b o v e 3 points
OK?
Does the error E3
rec u r?
NO
Is the
operating
press u re of the high
press u re switch normal
(4.0 MPa
(580 psi))?
NO
(1) Mo u nt a press u re ga u ge on the high press u re
ser v ice port.
(2) Reset the operation u sing the remote controller,
and then restart the operation.
A
Check for the following 3 points:
(1) Is the stop
v al v e open?
(2) Is the high press u re switch connector properly
connected to the o u tdoor u nit main PCB?
(3) Is there contin u ity across the high press u re switch?
Caution
Be s u re to t u rn off the power switch b efore connecting or disconnecting
connectors, or parts may b e damaged.
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