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Troubleshooting SiUS091133
113 Service Diagnosis
4.11 Outdoor Unit PCB Abnormality
Remote
Controller
Display
E1
Method of
Malfunction
Detection
The system checks if the microprocessor is working in order.
The system checks 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, etc.
Troubleshooting 09/12/15/18 class
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
NO
YES
YES
(R16910)
YES
NO
NO
Replace the outdoor unit
PCB (2).
Ground the system.
Zero-cross signal
abnormality.
Replace the outdoor unit
PCB (1).
Replace the harness.
Check to see if the outdoor unit is
grounded.
Is LED A blinking?
Grounded?
Is the harness
broken?
Turn on the power again.
∗ Before you check the LED A,
cancel the standby electricity
saving function by starting fan
operation with the remote
controller.
∗ Wait at least for 7 sec. after
turning on the power.
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