Troubleshooting by Error Code SiUS331604E
167 Service Diagnosis
4.20 Activation of High Pressure Switch
Error Code E3
Applicable
Models
All outdoor units
Method of Error
Detection
Abnormality is detected when the contact of the high pressure protection switch opens.
Use the protection device circuit to test high pressure switch conduction.
Error Decision
Conditions
Error is generated when the high pressure switch activation count reaches the number specific to
the operation mode.
When part of the protection device has an open circuit
Reference: Operating pressure of high pressure switch
Operating pressure: 4.0 MPa (580 psi)
Reset pressure: 3.0 MPa (435 psi)
Supposed
Causes
Activation of outdoor unit high pressure switch
Defective high pressure switch
Defective outdoor main PCB
Instantaneous power failure
Defective high pressure sensor
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