Troubleshooting for Outdoor Unit SiUS12-928_B
165 Service Diagnosis
6.6 Outdoor Unit PCB Abnormality (24/32 Class Only)
Remote
Controller
Display
E1
Outdoor Unit LED
Display
A 5 1 4 2 4 3 4 4 3
Method of
Malfunction
Detection
Detect within the program of the microcomputer.
Malfunction
Decision
Conditions
The program of the microcomputer is in abnormal running order.
Supposed
Causes
Defective outdoor unit PCB
Noise
Momentary fall of voltage
Momentary power failure
Troubleshooting
(R7183)
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
YES
NO
NO
YES
Replace the outdoor unit PCB.
Carry out grounding work.
The cause can be external
factors other than malfunction.
Investigate the cause of noise.
Power on again
Error again?
Check to see that the unit is
grounded.
Grounded?
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