Service Manual

Troubleshooting by Error Codes SiUS281811E
222 Part 6 Service Diagnosis
4.29 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 switch opens.
Use the protection device circuit to test high pressure switch conduction.
Error Decision
Conditions
Part of the protection device has an open circuit.
Error is generated when the high pressure switch activation count reaches the number specific to
the operation mode.
Reference
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