SiUS281117
Troubleshooting by Remote Controller
110
Service Diagnosis
2.7
Indoor Unit PCB Abnormality
Remote
Controller
Display
A1
Applicable
Models
All indoor models
Method of Error
Detection
Check data from E²PROM.
Error Decision
Conditions
The error is generated when the data from the E²PROM is not received correctly.
E²PROM (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 E²PROM is slower than writing to RAM.
Supposed
Causes
Defective indoor unit PCB
External factor (Noise, etc.)
Troubleshooting
Replace the indoor unit PCB.
Normal reset?
NO
Switch the power OFF and
ON again to restart.
The error may be caused by
an external factor, rather
than damaged parts.
Locate the cause and correct
the situation.
YES
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Caution
