Troubleshooting by Error Codes SiUS281811EA
252 Part 6 Service Diagnosis
4.28 Outdoor Main PCB Abnormality
Error Code E1
Applicable
Models
All outdoor units
Method of Error
Detection
Abnormality is detected under the communication conditions in the hardware section between the
indoor unit and outdoor unit.
Error Decision
Conditions
When the communication conditions in the hardware section between the indoor unit and the
outdoor unit are not normal.
Supposed
Causes
Defective outdoor main PCB (A1P)
Disconnection of the inside/outside relay wires
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Return to normal?
YES
External factor other than
error (for example, noise
etc.).
Connect the inside/outside
relay wires correctly.
Replace the outdoor main
PCB (A1P).
NO
NO
Check if
inside/
outside relay wires of
outdoor main PCB are
disconnected.
YES
Turn OFF the power once and
turn ON again.
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