SiUS04-924 Troubleshooting
Service Diagnosis 81
4.8 Outdoor Unit PCB Abnormality
Remote
Controller
Display
E1
Method of
Malfunction
Detection
Detect within the program of the microcomputer that the program is in normal running order.
Malfunction
Decision
Conditions
When the program of the microcomputer is in abnormal running order.
Supposed
Causes
Out of control of microcomputer caused by external factors
Noise
Momentary drop in voltage
Momentary power loss
Defective outdoor unit PCB
Troubleshooting
(R7183)
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts damage may occur.
YES
NO
NO
YES
Power on again
Check to see that the machine is
grounded.
Replace the outdoor unit
PCB.
Carry out grounding work.
The cause can be external
factors other than
malfunction.
Investigate the cause of
noise.
Error again?
Grounded?
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