SiUS091628EA
Troubleshooting
Service Diagnosis
64
4.2
Indoor Unit PCB Abnormality
Error Code
A1
Method of Error
Detection
The system checks the data from EEPROM.
Error Decision
Conditions
The data from the EEPROM is not received correctly.
EEPROM (Electrically Erasable Programmable Read Only Memory): A memory chip that holds its
content without power. It can be erased, either within the computer or externally and usually
requires more voltage for erasure than the 5 volts used in logic circuits. It functions like
non-volatile RAM, but writing to EEPROM is slower than writing to RAM.
Supposed
Causes
Defective indoor unit PCB
External factor (noise etc.)
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
(R22247)
Normal?
Turn off the power. Then, turn on
the power to restart the system.
NO
YES
External factor other than malfunction
(for example, noise etc.)
Replace the indoor unit PCB
(control PCB).
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