SiUS041111 Troubleshooting
Service Diagnosis 89
4.8 Outdoor Unit PCB Abnormality
Remote
Controller
Display
E1
Method of
Malfunction
Detection
The system follows the microprocessor program as specified.
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
Defective outdoor unit PCB
Broken harness between PCBs
Noise
Momentary fall of voltage
Momentary power failure
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
NO
YES
YES
(R14253)
YES
NO
NO
Replace the outdoor unit
PCB.
Ground the system.
Zero-cross signal
abnormality.
Replace the outdoor unit
PCB.
Replace the harness.
Turn on the power again.
Is LED A blinking?
Check to see if the outdoor unit is
grounded.
Grounded?
Is the harness
broken?
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