Troubleshooting SiENBE04-507A
120 Service Diagnosis
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
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)
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Is LED A flashing?
Grounded?
Is the harness
broken?
Check to see if the system is
grounded.
Caution
NO
YES
NO
YES
NO
YES
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