SiBE05-513A Troubleshooting
Service Diagnosis 89
4.8 Outdoor Unit PCB Abnormality
Remote
Controller
Display
E1
Method of
Malfunction
Detection
The system follows the microprocessor program to make sure it runs normally.
The system checks to see if the zero-cross signal comes in properly.
Malfunction
Decision
Conditions
The microprocessor program runs out of control.
The zero-cross signal is not detected.
Supposed
Causes
The microcomputer is out of control due to external factors.
Noise
Momentary voltage drop
Momentary power failure, etc.
Outdoor unit PCB defective
Broken harness between PCBs
Troubleshooting
Check the indoor and outdoor unit
model numbers.
Match the compatible
models.
Change for the specified
PCB (1) or (2).
Replace the indoor unit
PCB (1) (or the outdoor unit
PCB).
(Q0347)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Indoor unit and outdoor unit
matched?
NO
YES
YES
Matched compatibly?
NO
Check the code numbers
(2P01234, for example) of the
indoor and outdoor unit PCB with
the Parts List.
Turn on the power again.
Replace the outdoor unit
PCB (1).
Ground the system.
Zero-cross signal
abnormality. Replace the
outdoor unit PCB (2).
Replace the harness.
(R4563)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Is LED A flashing?
NO
YES
YES
YES
Grounded?
NO
NO
Is the harness
broken?
Check to see if the system is
grounded.
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