Troubleshooting by Remote Controller ESIE15-13B
124 Service Diagnosis
4.4 Indoor Unit PCB Abnormality
Remote
Controller
Display
A1
Applicable
Models
All models of indoor unit
Method of Error
Detection
Check data from E
2
PROM.
Error Decision
Conditions
The error is generated when the data from the E
2
PROM is not received correctly.
E
2
PROM (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 common +5 volts used in logic circuits. It functions
like non-volatile RAM, but writing to E
2
PROM is slower than writing to RAM.
Supposed
Causes
Defective indoor unit PCB
External factor (Noise, etc.)
Troubleshooting
Replace the indoor unit PCB.
The error may be caused by an
external factor, rather than
damaged parts.
Locate the cause and correct
the situation.
Is it normal?
NO
Caution
Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Turn OFF the power supply and turn
the power ON again.
YES
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