SiUS331604E Troubleshooting by Error Code
Service Diagnosis 136
4.2 Indoor Unit PCB Abnormality
Error Code A1
Applicable
Models
All indoor units
Method of Error
Detection
Data from EEPROM is checked.
Error Decision
Conditions
When data cannot be correctly received from the EEPROM
EEPROM: Type of nonvolatile memory. Maintains memory contents even when the power supply is
turned OFF.
Supposed
Causes
Defective indoor unit PCB
External factor (Noise etc.)
Troubleshooting
YES
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Turn the power supply OFF,
then the power ON again.
Does the
system return to
normal?
The indoor unit main
PCB (A1P) is normal.
External factor other than
error (for example, noise
etc.).
Replace the indoor unit
main PCB (A1P).
NO
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