Troubleshooting Si04-402A
84 Service Diagnosis
4.10 Outdoor Unit PCB Abnormality
Remote
Controller
Display
E1
Method of
Malfunction
Detection
The proper programme operation of the microcomputer is checked by the programme.
Checking whether the EEPROM data have the information of the outdoor unit
Malfunction
Decision
Conditions
When the microcomputer programme does not function properly
When the information of the outdoor unit (the type of the electronic expansion valve) is
unidentified in the EEPROM data
Supposed
Causes
Microcomputer programme run-away due to an external factor.
∗Noise
∗Momentary voltage drop
∗Momentary power failure, etc.
Unidentified information of the outdoor unit
∗Damage of the EEPROM
Faulty outdoor unit PCB.
Troubleshooting
Turn on the power again.
Check the grounding.
YES
YES
Replace the outdoor unit
PCB.
The electronic expansion
valve is unidentified.
Replace the outdoor unit
PCB.
Provide proper grounding.
The malfunction may be
caused by an external
factor, rather than defective
parts.
Locate the cause of the
noise, etc., and correct the
situation.
Does
the LEDA
turn on a light
again?
NO
NO
(R4000)
Is the grounding
proper?
YES
Does
the LEDA
switch the light off after
blinking about 30
seconds?
NO
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
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